Cannabis was criminalized in various countries beginning in the 19th century. The British colonies of Mauritius banned cannabis in 1840 over concerns on its effect on Indian indentured workers;[194] the same occurred in British Singapore in 1870.[195] In the United States, the first restrictions on sale of cannabis came in 1906 (in District of Columbia).[196] It was outlawed in Jamaica (then a British colony) in 1913, in South Africa in 1922, and in the United Kingdom and New Zealand in the 1920s.[197] Canada criminalized cannabis in The Opium and Narcotic Drug Act, 1923,[198] before any reports of the use of the drug in Canada, but eventually legalized its consumption for recreational and medicinal purposes in 2018.[37]
It has been contended that hemp is notably superior to most crops in terms of biomass production, but van der Werf (1994b) noted that the annual dry matter yield of hemp (rarely approaching 20 t/ha) is not exceptional compared to maize, beet, or potato. Nevertheless, hemp has been rated on a variety of criteria as one of the best crops available to produce energy in Europe (Biewinga and van der Bijl 1996). Hemp, especially the hurds, can be burned as is or processed into charcoal, methanol, methane, or gasoline through pyrolysis (destructive distillation). As with maize, hemp can also be used to create ethanol. However, hemp for such biomass purposes is a doubtful venture in North America. Conversion of hemp biomass into fuel or alcohol is impractical on this continent, where there are abundant supplies of wood, and energy can be produced relatively cheaply from a variety of sources. Mallik et al. (1990) studied the possibility of using hemp for “biogas” (i.e. methane) production, and concluded that it was unsuitable for this purpose. Pinfold Consulting (1998) concluded that while there may be some potential for hemp biomass fuel near areas where hemp is cultivated, “a fuel ethanol industry is not expected to develop based on hemp.”
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The public meeting will be held via telephone conference. Access to the conference call can be made at or by calling 1-408-638-0986 (U.S. toll) or 1-646-876-9923 (U.S. toll). The meeting ID is 840-748-948 . Participants will be prompted to enter their name and email address to enter the meeting via the website, or prompted for a unique participant ID for the call. They should press # to access the call.
About 9% of those who experiment with marijuana eventually become dependent according to DSM-IV (1994) criteria.[74] A 2013 review estimates daily use is associated with a 10-20% rate of dependence.[41] The highest risk of cannabis dependence is found in those with a history of poor academic achievement, deviant behavior in childhood and adolescence, rebelliousness, poor parental relationships, or a parental history of drug and alcohol problems.[129] Of daily users, about 50% experience withdrawal upon cessation of use (i.e. are dependent), characterized by sleep problems, irritability, dysphoria, and craving.[110] Cannabis withdrawal is less severe than withdrawal from alcohol.[130] provides accurate and independent information on more than 24,000 prescription drugs, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. Data sources include Micromedex® (updated Nov 1st, 2018), Cerner Multum™ (updated Nov 1st, 2018), Wolters Kluwer™ (updated Oct 31st, 2018) and others. To view content sources and attributions, please refer to our editorial policy.
A large, retrospective cohort study of 64,855 men aged 15 to 49 years from the United States found that Cannabis use was not associated with tobacco-related cancers and a number of other common malignancies. However, the study did find that, among nonsmokers of tobacco, ever having used Cannabis was associated with an increased risk of prostate cancer.[6]
In September 2005, New Scientist reported that researchers at the Canberra Institute of Technology had identified a new type of Cannabis based on analysis of mitochondrial and chloroplast DNA.[80] The New Scientist story, which was picked up by many news agencies and web sites, indicated that the research was to be published in the journal Forensic Science International.[81]

Cannabis use generally makes psychotic symptoms worse and lowers the person’s chances of recovery from a psychotic episode. People with a psychotic illness who use drugs experience more delusions, hallucinations and other symptoms. They have a higher rate of hospitalisation for psychosis, and treatment is generally less effective for them. People with a psychotic illness should not use cannabis.
Users have reported toxic symptoms, extreme reactions and serious psychological problems from using synthetic cannabis. These include: high blood, pressure, abdominal pain, nausea and vomiting, chest pain, heart palpitations, severe anxiety and paranoia, fear of dying, hallucinations, tremors and seizures, violent behaviour, and suicidal thoughts. These toxic symptoms have lasting several days and others have experienced long term mental health issues. Tolerance can develop quickly which means you will need more to get the same effect.
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.
Although CBD oils aren’t regulated by the FDA, purchasing products stateside from one of the nine states where recreational and medical cannabis use is legal will likely result in a higher-quality product than buying one made with hemp-derived CBD oil imported from abroad, says Martin Lee, director of Project CBD, a nonprofit that promotes medical research into CBD.
Even without changes at the federal level, there are steps that states could take on their own to make the CBD market safer. States with broad marijuana legality or CBD-only measures could mandate the calibration and regulation of testing labs, and use them to conduct safety testing. They could fund research into the benefits, dosing, and drug interactions of CBD through their public university systems. Medical boards could redouble efforts to educate physicians in what research exists regarding medical marijuana in all its incarnations, so that doctors are prepared to prescribe and manage these medications as they become available.

If you decide to cut back or stop after using cannabis regularly, you may experience psychological and physical withdrawal symptoms such as irritability, sleep difficulty, vivid dreams, and decreased appetite. Talk to a trusted friend or family member about your plan to change, and ask them to look out for and support you. Alternatively, call Alcohol and Drug Helpline 0800 787 797 for confidential, non-judgmental advice and referral to a local service provider.
One of the biggest players in this new industry is Medical Marijuana, Inc., a company formed in 2009 that operates out of Poway, California, just north of San Diego. It has played a leading role in the so-called Green Rush, as businesses have moved quickly to capitalize on the gradual legalization of marijuana for medical and recreational purposes by states across the country. The company’s spokesman, Andrew Hard, boasted that Medical Marijuana, Inc., “created the CBD industry and was first to market with CBD products.” Through its various subsidiaries, Medical Marijuana, Inc. sells some of the most recognizable products on the cannabis market— everything from Cibaderm CBD-infused shampoo to CanChew chewing gum. In 2014, the company generated $14.5 million in revenue.

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