Cannabis Smoking

Cannabis smoking involves inhaling vapors released by heating the flowers and subtending leaves of the Cannabis plants, known as marijuana. Alternatively, the cannabis plant flowers may be finely sifted producing kief, a powder especially rich in the oil-glands or trichomes which contain the highest amounts of cannabinoids. In exporting countries the kief is usually pressed under heat to form solid cakes of hashish, easily stored and shipped, which is widely marketed for smoking use. Cannabis is consumed for its hallucinogenic and sedative effects for recreation, to produce a feeling of euphoria, medically to stimulate the appetite or to suppress nausea, or by inventors and artists in pursuit of creativity.

Smoking releases the main psychoactive chemical in cannabis, Δ9-tetrahydrocannabinol (THC), which is absorbed into the bloodstream via the lungs. It then mostly targets the brain, where it binds to cannabinoid receptors. The immune system also contains cannabinoid receptors and may modulate its function. The cannabinoid receptors receive the THC and other cannabinoids, leading to the feeling of a mental "high," which varies strongly by person. Studies have also found that the heating of cannabis (which can be achieved without the health hazards of combustion by means of a vaporizer) results in the production of additional THC from the decarboxylation of the non-psychoactive Δ9-tetrahydrocanabinoid acid (THCa).

While cannabis can be consumed orally, the bioavailability characteristics and effects of this method are different from smoking. The effect of cannabis when eaten takes longer to begin, is typically longer-lasting, and can result in a more powerful psychoactive effect than expected.

Cannabis can be smoked in a variety of pipe-like implements made in different shapes and of different materials ("bowls"), water pipes ("bongs"), cigarettes ("joints"), or cigars ("blunts").

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... use was when he attended a wild party at Ste and Amy's council flat where he was pressurised into smoking cannabis by Ste ... As a result, Fletch started smoking cannabis on a regular basis as he enjoyed it ... down, Sasha decided to join in with Fletch's hobby and they both started smoking cannabis together ...
Cannabis Smoking - Health Effects - Lung Cancer Risk and Lung Function
... data on the correlation of an increase in the incidence of lung cancer and cannabis smoking ... from 1966 to 2006 found no significant tobacco-adjusted association between cannabis smoking and lung cancer development despite evidence of precancerous histopathologic changes of the ... However, a pooled analysis of three studies of male cannabis smokers in North Africa found that the odds ratio for developing lung cancer was 2.4 (95% CI, 1.6–3.8) for ...
Medical Cannabis - Criticism - Lung Cancer and Chronic Obstructive Pulmonary Disease
... The evidence to date is conflicting as to whether smoking cannabis increases the risk of developing lung cancer or chronic obstructive pulmonary disease (COPD) among people who do ... suggested that smoking cannabis does not, by itself, increase the risk of lung cancer ... strongly synergistic effect, however, between tobacco use and smoking cannabis such that tobacco smokers who also smoked cannabis dramatically increased their already very high risk of developing lung ...

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