^ Jump up to: a b c Whiting, PF; Wolff, RF; Deshpande, S; Di Nisio, M; Duffy, S; Hernandez, AV; Keurentjes, JC; Lang, S; Misso, K; Ryder, S; Schmidlkofer, S; Westwood, M; Kleijnen, J (23 June 2015). "Cannabinoids for Medical Use: A Systematic Review and Meta-analysis" (PDF). JAMA. 313 (24): 2456–2473. doi:10.1001/jama.2015.6358. hdl:10757/558499. PMID 26103030.
Cannabis plants produce a unique family of terpeno-phenolic compounds called cannabinoids, some of which produce the "high" which may be experienced from consuming marijuana. There are 483 identifiable chemical constituents known to exist in the cannabis plant,[49] and at least 85 different cannabinoids have been isolated from the plant.[50] The two cannabinoids usually produced in greatest abundance are cannabidiol (CBD) and/or Δ9-tetrahydrocannabinol (THC), but only THC is psychoactive.[51] Since the early 1970s, Cannabis plants have been categorized by their chemical phenotype or "chemotype", based on the overall amount of THC produced, and on the ratio of THC to CBD.[52] Although overall cannabinoid production is influenced by environmental factors, the THC/CBD ratio is genetically determined and remains fixed throughout the life of a plant.[37] Non-drug plants produce relatively low levels of THC and high levels of CBD, while drug plants produce high levels of THC and low levels of CBD. When plants of these two chemotypes cross-pollinate, the plants in the first filial (F1) generation have an intermediate chemotype and produce intermedite amounts of CBD and THC. Female plants of this chemotype may produce enough THC to be utilized for drug production.[52][53]
HempWorx CBD is short for HempWorx CBD (cannabidiol) products featuring HempWorx CBD oil and 5 additional CBD products. The HempWorx CBD oil products are full spectrum meaning they consist of many parts of the hemp plant with a host of cannabinoids rather than isolated CBD alone. Our third party lab test results show you the breakdown of the cannabinoid profile and potency. Full spectrum CBD Oil combines the powerful active ingredients of the hemp plant to create an entourage effect which has been shown to be more effective in treating conditions such as chronic pain than isolated CBD only.
Another claim is that Mellon, Secretary of the Treasury and the wealthiest man in America at that time, had invested heavily in DuPont's new synthetic fiber, nylon, and believed[dubious – discuss] that the replacement of the traditional resource, hemp, was integral to the new product's success.[128][133][134][135][136][137][138][139] The company DuPont and many industrial historians dispute a link between nylon and hemp, nylon became immediately a scarce commodity.[clarification needed] Nylon had characteristics that could be used for toothbrushes (sold from 1938) and very thin nylon fiber could compete with silk and rayon in various textiles normally not produced from hemp fiber, such as very thin stockings for women.[132][140][141][142][143]

One of the most curious uses of hemp is as a fence to prevent pollen transfer in commercial production of seeds. Isolation distances for ensuring that seeds produced are pure are considerable for many plants, and often impractical. At one point in the 1980s, the only permitted use of hemp in Germany was as a fence or hedge to prevent plots of beets being used for seed production from being contaminated by pollen from ruderal beets. The high and rather inpenetrable hedge that hemp can produce was considered unsurpassed by any other species for the purpose. As well, the sticky leaves of hemp were thought to trap pollen. However, Saeglitz et al. (2000) demonstrated that the spread of beet pollen is not effectively prevented by hemp hedges. Fiber (i.e. tall) cultivars of hemp were also once used in Europe as wind-breaks, protecting vulnerable crops against wind damage. Although hemp plants can lodge, on the whole very tall hemp is remarkably resistant against wind.

Right now, there’s a good chance that you don’t really know what you’re getting from any source. Testing and labeling rules vary by state, but many states that allow legal cannabis also require some kind of testing to verify that the THC and CBD levels listed on the label are accurate. However, this testing is controversial, and results can vary widely between labs, Jikomes said. A study published in March found measurable variations in test results, with some labs consistently reporting higher or lower levels of cannabinoids than others. There are no guarantees that the label accurately reflects what’s in the product. For a 2015 study published in JAMA, researchers tested 75 products purchased in San Francisco, Los Angeles and Seattle and found that only 17 percent were accurately labeled. More than half of the products contained significantly lower levels of cannabinoids than the label promised, and some of them contained only negligible amounts of the compounds. “We need to come up with ways to confidently verify the composition of cannabis products and make this information available to consumers,” Jikomes said.
Health psychology, developed in the late 1970s, is its own domain of inquiry. A health psychologist, also called a medical psychologist, helps individuals explore the link between emotions and physical health. The health psychologist also helps physicians and medical professionals understand the emotional effects of a patient’s illness or disease. These experts practice in such areas of health as chronic pain management, oncology, physical rehabilitation, addiction treatment, and eating disorders, among others. Health psychologists can be found in clinics, hospitals, private practice, and public health agencies. Some also work in corporate settings to promote health and wellness among employees, engaging in workplace policies and decision-making. 

“It probably should be called snake oil,” says Tishler. (So...save your cash.) Not only does hemp oil not have any real health benefits, but it may contain stuff that's actually bad for you. "At the moment what you can buy is less regulated than the potato at the supermarket," says Tishler. When hemp oil is extracted, there's a risk that pesticides, plastics, and heavy metals could make their way in, says Tishler.
In some areas where cannabis use had been historically tolerated, new restrictions were instituted, such as the closing of cannabis coffee shops near the borders of the Netherlands,[222] and closing of coffee shops near secondary schools in the Netherlands.[223] In Copenhagen, Denmark in 2014, mayor Frank Jensen discussed possibilities for the city to legalize cannabis production and commerce.[224]
An increasing number of studies and reports from different organizations and contexts examine the linkages between health and different factors, including lifestyles, environments, health care organization and health policy, one specific health policy brought into many countries in recent years was the introduction of the sugar tax. Beverage taxes came into light with increasing concerns about obesity, particularly among youth. Sugar-sweetened beverages have become a target of anti-obesity initiatives with increasing evidence of their link to obesity.[21]– such as the 1974 Lalonde report from Canada;[20] the Alameda County Study in California;[22] and the series of World Health Reports of the World Health Organization, which focuses on global health issues including access to health care and improving public health outcomes, especially in developing countries.[23]
Fatty acids and GLA may also help curb the physical and emotional pain linked to PMS. Here's why: One of the causes of PMS is a hormonal imbalance that leads to a lack of GLA in the body. Research on GLA has shown to help alleviate the symptoms of PMS by bringing hormone levels back into balance. But so far, studies haven't found ingesting or slathering on hemp oil itself will have this effect.
These days I’m a believer. It’s difficult to ignore the fact that Epidiolex—the CBD-based epilepsy medication—was approved by the F.D.A last year. Or that athletes are abandoning NSAIDs (nonsteroidal anti-inflammatory drugs, such as ibuprofen or naproxen) for greener alternatives. Then there are Alfie Dingley and Billie Caldwell in the UK: Their cases involving rare forms of epilepsy have prompted UK home secretary Sajid Javid to say that specialists will soon be able to prescribe cannabis-based medication. Beyond that, nearly 7% of Americans are already using CBD—and given the population, that’s a staggering number.
CBD Oil refers to CBD-infused products that contain CBD suspended in an oily base, such as vegetable glycerin, hemp seed oil, or another plant-derived oil. Sublingual oils are ideal because they allow for rapid absorption of CBD through the membrane under your tongue directly into your bloodstream. CBD Oils are available in both low and high doses, and droppers built into the cap make it easy to measure your proper dose. CBD Oils are the most popular kind of CBD product thanks to their ease of use and rapid effects.
Medical cannabis (or medical marijuana) refers to the use of cannabis and its constituent cannabinoids, to treat disease or improve symptoms. Cannabis is used to reduce nausea and vomiting during chemotherapy, to improve appetite in people with HIV/AIDS, and to treat chronic pain and muscle spasms.[103][104] Cannabinoids are under preliminary research for their potential to affect stroke.[105]
Sublingual CBD Oils – also known as CBD Tinctures or CBD Hemp Oil – are the most popular type of CBD products, because of their high bioavailability and rapid absorption. There are many other kinds of products as well, including CBD edibles, CBD topicals, and even CBD-infused Coffee. CBD products have gained immense popularity in health and wellness circles thanks to their natural support of our endocannabinoid system (ECS).
Peltz will be granted options to purchase 19.9 million common shares in the company at C$10.34 ($7.74) a share. The options will vest over a four-year period on a quarterly basis, and the vesting may accelerate if the company meet certain goals, including the consummation of certain defined transactions and the share price being at least at C$31.02 and C$41.36 for a specified number of trading days.
Hemp is considered by a 1998 study in Environmental Economics to be environmentally friendly due to a decrease of land use and other environmental impacts, indicating a possible decrease of ecological footprint in a US context compared to typical benchmarks.[63] A 2010 study, however, that compared the production of paper specifically from hemp and eucalyptus concluded that "industrial hemp presents higher environmental impacts than eucalyptus paper"; however, the article also highlights that "there is scope for improving industrial hemp paper production".[64] Hemp is also claimed to require few pesticides and no herbicides, and it has been called a carbon negative raw material.[65][66] Results indicate that high yield of hemp may require high total nutrient levels (field plus fertilizer nutrients) similar to a high yielding wheat crop.[67]
Hemp fibers are primarily used for textiles, paper, building materials, and other industrial products. Hurds, or shives, are short woody hemp fibers typically found inside the stalk. They’re used to make hempcrete, bedding materials, absorbents, particle board, ceiling panels, compost, and other industrial products. Bast fibers make up the outer portion of the stalk and are typically split into three categories — primary, or line fiber, secondary, and the tow. They are categorized according to their cell strength and cell wall thickness, which will determine the fiber’s strength, durability, and ultimately what the it can be used for.
Probably indigenous to temperate Asia, C. sativa is the most widely cited example of a “camp follower.” It was pre-adapted to thrive in the manured soils around man’s early settlements, which quickly led to its domestication (Schultes 1970). Hemp was harvested by the Chinese 8500 years ago (Schultes and Hofmann 1980). For most of its history, C. sativa was most valued as a fiber source, considerably less so as an intoxicant, and only to a limited extent as an oilseed crop. Hemp is one of the oldest sources of textile fiber, with extant remains of hempen cloth trailing back 6 millennia. Hemp grown for fiber was introduced to western Asia and Egypt, and subsequently to Europe somewhere between 1000 and 2000 BCE. Cultivation in Europe became widespread after 500 ce. The crop was first brought to South America in 1545, in Chile, and to North America in Port Royal, Acadia in 1606. The hemp industry flourished in Kentucky, Missouri, and Illinois between 1840 and 1860 because of the strong demand for sailcloth and cordage (Ehrensing 1998). From the end of the Civil War until 1912, virtually all hemp in the US was produced in Kentucky. During World War I, some hemp cultivation occurred in several states, including Kentucky, Wisconsin, California, North Dakota, South Dakota, Minnesota, Indiana, Illinois, Ohio, Michigan, Kansas, and Iowa (Ehrensing 1998). The second world war led to a brief revival of hemp cultivation in the Midwest, as well as in Canada, because the war cut off supplies of fiber (substantial renewed cultivation also occurred in Germany for the same reason). Until the beginning of the 19th century, hemp was the leading cordage fiber. Until the middle of the 19th century, hemp rivaled flax as the chief textile fiber of vegetable origin, and indeed was described as “the king of fiber-bearing plants,—the standard by which all other fibers are measured” (Boyce 1900). Nevertheless, the Marihuana Tax Act applied in 1938 essentially ended hemp production in the United States, although a small hemp fiber industry continued in Wisconsin until 1958. Similarly in 1938 the cultivation of Cannabis became illegal in Canada under the Opium and Narcotics Act.

A colleague of Mechoulam’s, Marc Feldman at Imperial College, London, tested CBD on mice that had a version of rheumatoid arthritis. He found that CBD reduced the mice’s inflammation by 50% at the right dosage. Cardiologists working with the mice at Hebrew University have found that a dosage of CBD immediately following a heart attack can reduce infarct size by about 66%.
Health science is the branch of science focused on health. There are two main approaches to health science: the study and research of the body and health-related issues to understand how humans (and animals) function, and the application of that knowledge to improve health and to prevent and cure diseases and other physical and mental impairments. The science builds on many sub-fields, including biology, biochemistry, physics, epidemiology, pharmacology, medical sociology. Applied health sciences endeavor to better understand and improve human health through applications in areas such as health education, biomedical engineering, biotechnology and public health.

During the period from 1937 to the late 60s, the U.S. government understood and acknowledged that industrial hemp and marijuana were distinct varieties of the Cannabis plant. Hemp was no longer officially recognized as distinct from marijuana after the passage of the Controlled Substances Act (CSA) of 1970. This is despite the fact that a specific exemption for hemp was included in the CSA under the definition of marijuana. The recent federal court case HIA vs DEA has re-established acknowledgement of distinct varieties of Cannabis, and supports the exemption for non-viable seed and fiber and any products made from them.
Hempworx Distributors can sell all of the other My Daily Choice products worldwide. If you like those products you may want to get started that way.  This was the last PDF Hempworx distributed. If you scroll down the PDF file, near the end, you will see the timetable for reentering the EU, Canada, and Ghana. Hempworx missed the July target date to begin shipping to Canada.
Highly selected forms of the fiber cultigen possess features maximizing fiber production. Since the nodes tend to disrupt the length of the fiber bundles, thereby limiting quality, tall, relatively unbranched plants with long internodes have been selected. Another strategy has been to select stems that are hollow at the internodes, with limited wood, since this maximizes production of fiber in relation to supporting woody tissues. Similarly, limited seed productivity concentrates the plant’s energy into production of fiber, and fiber cultivars often have low genetic propensity for seed output. Selecting monoecious strains overcomes the problem of differential maturation times and quality of male (staminate) and female (pistillate) plants (males mature 1–3 weeks earlier). Male plants in general are taller, albeit slimmer, less robust, and less productive. Except for the troublesome characteristic of dying after anthesis, male traits are favored for fiber production, in contrast to the situation for drug strains noted below. In former, labor-intensive times, the male plants were harvested earlier than the females, to produce superior fiber. The limited branching of fiber cultivars is often compensated for by possession of large leaves with wide leaflets, which obviously increase the photosynthetic ability of the plants. Since fiber plants have not generally been selected for narcotic purposes, the level of intoxicating constituents is usually limited.
Cannabis, also known as marijuana among other names,[a] is a psychoactive drug from the Cannabis plant used for medical or recreational purposes.[16][17][18] The main psychoactive part of cannabis is tetrahydrocannabinol (THC), one of 483 known compounds in the plant,[19] including at least 65 other cannabinoids.[20] Cannabis can be used by smoking, vaporizing, within food, or as an extract.[21]
Fig. 25. The “hemp house” under construction on the Oglala Lakota Nation (Pine Ridge Reservation), South Dakota. Foundation blocks for the house are made with hemp fiber as a binder in cement. Stucco is also of hemp. Shingles are 60% hemp in a synthetic polymer. Hemp insulation is used throughout. (Courtesy of Oglala Sioux Tribe, Slim Butte Land Use Association, and S. Sauser.)
Omega-3 and omega-6s have been shown to help treat conditions like atopic dermatitis (a.k.a. eczema), which can leave your skin dry and itchy. GLA in particular has been shown to improve dry skin and eczema. One 2005 study even found people who consumed hempseed oil for 20 weeks had a reduction in oil and reduced the symptoms and appearance of eczema after 20 weeks. But that research is preliminary, Tishler points out.
Should any legal disputes arise between a distributor and the company, proceedings shall take place in Dallas, Texas, where the matter will be resolved by “mandatory, final, binding, nonappealable arbitration.” However, if the distributor wins, it won’t be a great victory as damages are “limited to the amount of products [he or she] has purchased from the company that are in resalable condition.”

Executives from Canopy Growth CGC, -1.45% WEED, -1.59%  and rival Aurora Cannabis Inc. ACB, +13.94% ACB, +12.97%  both discussed their hemp operations on September-quarter earnings calls that included disappointing results related to early recreational pot sales. Aurora declined to comment on the latest developments and Canopy did not make executives available by the time of publication.
I can’t disagree more with attacking “Big Pharma” or Trump with regards to fixing this problem! Screw the political affiliations for now, let’s change the whole Schedule 1 nightmare. We’re steeped in technology and we have insanely archaic drug laws. Worse, our gov then pressures the countries we give money to (which is all of them) to follow suit by adopting our effed up way. Schedule 1 needs to be dismantled. The research can’t be done on anything listed with very few exceptions. There’s other Sched.1 drugs that need to be available for research by legitimate people, there’s lots of exciting research in psychedelics that’s stalled by archaic laws. That part might just require big pharma to help.
Military, Police, Doctors, Truck Drivers, Nurses, Government Workers can now enjoy the benefits of CBD without the worry of losing their job!  THC FREE CBD OIL!! Yes you heard me. THC FREE!!!  From D.O.T. workers to Zero Tolerance Employer Test Takers to Pain Management customers. Yes you will no longer have the fear of failing a drug test!! THC FREE means just that!!! 
HempWorx 750 CBD Oil is trusted by health professionals and doctors worldwide. Our products are not only made and sold in USA, they have also picked up quite a following worldwide and we are currently shipping to Canada, Australia, and more than 85 countries. Hemp Worx 750 CBD Oil products are backed by strict testing standards of every batch. Our CBD maintains standards of being Non-GMO, natural, organic and pure, safe and effective to use. We post our batch testing right on the website.

Cannabis consumers have long prized potency (a high THC content) as one of the main factors that makes a particular strain more desirable. Though traditional demand for THC has caused an oversaturation of high-potency products, many consumers are starting to prefer less intense products that are lower in THC and higher in the non-intoxicating compound called cannabidiol (CBD).
CBD(Cannabidiol) is a cannabis compound that has significant medical benefits, but does not make people feel “high”. The fact that CBD-rich cannabis is non-psychoactive (as opposed to a THC dominant strain) makes it an appealing option for patients looking for relief from inflammation, pain, psychosis, seizures, spasms, and many other conditions without feelings of lethargy or dysphoria. Hemp Worx 750 is CBD dominant oil!
Industrial hemp is from the plant species Cannabis sativa and has been used worldwide to produce a variety of industrial and consumer products. Hemp is a source of fiber and oilseed grown in more than 30 nations. In the United States production is controlled under drug enforcement laws. To produce industrial hemp in the United States the grower must obtain a permit from the Drug Enforcement Agency (DEA).
For profitable hemp farming, particularly deep, humus-rich, nutrient-rich soil with controlled water flow is preferable. Waterlogged acidic, compressed or extremely light (sandy) soils primarily affect the early development of plants.[citation needed] Steep and high altitudes of more than 400 m above sea level are best avoided. Hemp is relatively insensitive to cold temperatures and can withstand frost down to −5 °C.[citation needed] Seeds can germinate down to 1–3 °C.[citation needed] Hemp needs a lot of heat, so earlier varieties come to maturation. The water requirement is 300–500 l/kg dry matter.[citation needed] This is around 1/14th that of cotton, which takes between 7,000 and 29,000 l/kg, according to WWF.[citation needed] Roots can grow up to 3 feet into the soil and use water from deeper soil layers.
An important way to maintain your personal health is to have a healthy diet. A healthy diet includes a variety of plant-based and animal-based foods that provide nutrients to your body. Such nutrients give you energy and keep your body running. Nutrients help build and strengthen bones, muscles, and tendons and also regulate body processes (i.e. blood pressure). The food guide pyramid is a pyramid-shaped guide of healthy foods divided into sections. Each section shows the recommended intake for each food group (i.e. Protein, Fat, Carbohydrates, and Sugars). Making healthy food choices is important because it can lower your risk of heart disease, developing some types of cancer, and it will contribute to maintaining a healthy weight.[44]
Choosing CBD products isn’t as simple as picking something off the dispensary shelf and then walking out the door. Consumers should be aware that a handful of hemp products on the market pay lip service to governmental regulations by labeling themselves as hemp, despite containing cannabinoids and terpenoids. Some CBD products are completely devoid of cannabinoids including CBD, despite package labeling. The FDA purchased a number of CBD products online in 2015 and 2016 to test them for the presence of CBD and other cannabinoids. They found that the amount of CBD these products claimed on their labels was markedly inaccurate; some didn’t even contain CBD.
More recent studies have focused on the mechanisms behind the schizophrenia–cannabis interaction. Epstein and Kumra (2014) tested the effect of cannabis on executive control of attention and cognitive function by comparing scores on the Attention Network Test among people with early-onset schizophrenia (EOS) and cannabis use disorder, only EOS, only cannabis use disorder, and controls. They found that the first group in particular had less efficient executive control of attention compared with those who had only EOS. They also found a smaller right caudal anterior cingulate cortex in subjects with EOS and cannabis use disorder. However, it is presently unclear whether this means that the smaller cortex surface leads to deficits in self-regulation and heavy cannabis use or if the direction of causation is in the opposite direction. More recent studies have suggested gene–environment correlation between cannabis use and schizophrenia in that the increased risk of schizophrenia after heavy and consistent cannabis use may be moderated by a shared gene that may explain part of the association (Power et al., 2014).
Hemp fibers are primarily used for textiles, paper, building materials, and other industrial products. Hurds, or shives, are short woody hemp fibers typically found inside the stalk. They’re used to make hempcrete, bedding materials, absorbents, particle board, ceiling panels, compost, and other industrial products. Bast fibers make up the outer portion of the stalk and are typically split into three categories — primary, or line fiber, secondary, and the tow. They are categorized according to their cell strength and cell wall thickness, which will determine the fiber’s strength, durability, and ultimately what the it can be used for.
Another thing I learned: CBD becomes more effective when taken in conjunction with a low dose of THC (tetradhydrocannabinoid, the psychoactive component of cannabis). For those who worry about getting high, fear not. I was initially concerned about the possibility of diminished faculties. After all, many single-serving THC edibles start at 10mg—but it’s good to note that most people won’t need even half as much. So you can do as I do and cut THC chocolate squares or gummies as you see fit—and then “pair” them with a CBD edible or tincture. I’ve also started to microdose edibles that contain both CBD and THC. (I quarter or halve a Dixie Synergy Milk Chocolate 1:1 depending on how I feel.)
In 1972, the Dutch government divided drugs into more- and less-dangerous categories, with cannabis being in the lesser category. Accordingly, possession of 30 grams or less was made a misdemeanor.[214] Cannabis has been available for recreational use in coffee shops since 1976.[215] Cannabis products are only sold openly in certain local "coffeeshops" and possession of up to 5 grams for personal use is decriminalised, however: the police may still confiscate it, which often happens in car checks near the border. Other types of sales and transportation are not permitted, although the general approach toward cannabis was lenient even before official decriminalisation.[216][217][218]
Another notable study conducted by Mechoulam was done on mice bred to have a version of type-1 diabetes. The diabetes was designed to manifest right around 14 weeks, so the mice were treated with CBD for the first 7 weeks of their life and then again in another 7 weeks. He concluded that only 30% had developed diabetes compared to the 90-100% given the placebo.

Cannabis is indigenous to Central Asia[192] and the Indian subcontinent,[193] and its use for fabric and rope dates back to the Neolithic age in China and Japan.[194][195] It is unclear when cannabis first became known for its psychoactive properties; some scholars suggest that the ancient Indian drug soma, mentioned in the Vedas, was cannabis, although this theory is disputed.[196]
By "a few drops a day" what do you mean? It says to "start at" 5 drops and work up to 15, if needed. I hate to talk negative about a product that I have yet to try so don't take it that way. However, 5-15 drops is a huge range and then 2X a day.....that bottle will empty pretty fast. Again, what is "a few drops a day" and how often are you taking a few drops? Thanks for your reply
States have passed laws creating or allowing for the establishment of industrial hemp research or pilot programs. State agencies and institutions of higher education administer these programs in order to study the cultivation, processing, and economics of industrial hemp. Pilot programs may be limited to a certain period of time and may require periodic reporting from participants and state agencies. Some states establish specific regulatory agencies or committees, rules, and goals to oversee the research programs. States may also require coordination between specific colleges or universities and the programs, in other states coordination is optional. From 2015 to 2016, seven states enacted legislation to create hemp research or pilot programs, including Pennsylvania (H.B. 976) and Hawaii (S.B. 2659).
There is certainly a need to utilize available germplasm sources in order to breed suitable cultivars for North America. A list of the 24 approved cultivars for the 2001 season in Canada is at www.hc-sc.gc.ca/hpb-dgps/therapeut/htmleng/hemp.html. Most of these are regulated by the European Organization of Economic Cooperation and Development (OECD). These cultivars are “approved” for use in Canada not on agricultural criteria, but merely on the basis that they meet the THC criterion. Indeed, most of these are unsuitable or only marginally suitable for Canada (Small and Marcus 2000), and only a very few Canadian cultivars to date have been created. In Canada, every acquisition of hemp grown at a particular place and time must be tested for THC content by an independent laboratory and, under the industrial hemp regulations, fields of hemp with more than 0.3% THC may require destruction (a slight degree of flexibility is generally exercised). Importation of experimental hemp lines (i.e. other than the approved cultivars) requires importation licenses (as well as phytosanitary clearance of the shipment by the Canadian Food Inspection Agency), and the importation licenses require an indication that the THC contents are low.
It is often claimed by growers and breeders of herbal cannabis that advances in breeding and cultivation techniques have increased the potency of cannabis since the late 1960s and early '70s when THC was first discovered and understood. However, potent seedless cannabis such as "Thai sticks" were already available at that time. Sinsemilla (Spanish for "without seed") is the dried, seedless inflorescences of female cannabis plants. Because THC production drops off once pollination occurs, the male plants (which produce little THC themselves) are eliminated before they shed pollen to prevent pollination. Advanced cultivation techniques such as hydroponics, cloning, high-intensity artificial lighting, and the sea of green method are frequently employed as a response (in part) to prohibition enforcement efforts that make outdoor cultivation more risky. It is often cited that the average levels of THC in cannabis sold in the United States rose dramatically between the 1970s and 2000, but such statements are likely skewed because undue weight is given to much more expensive and potent, but less prevalent samples.[253]
^ Jump up to: a b c Whiting, PF; Wolff, RF; Deshpande, S; Di Nisio, M; Duffy, S; Hernandez, AV; Keurentjes, JC; Lang, S; Misso, K; Ryder, S; Schmidlkofer, S; Westwood, M; Kleijnen, J (23 June 2015). "Cannabinoids for Medical Use: A Systematic Review and Meta-analysis" (PDF). JAMA. 313 (24): 2456–2473. doi:10.1001/jama.2015.6358. hdl:10757/558499. PMID 26103030.
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