Marijuana Addiction
Smoking of cannabis is the most harmful method of consumption, since the inhalation of smoke from organic materials such as cannabis, tobacco, wood and gasoline can cause various health problems.
In comparison, study on cannabis vaporizing found that subjects were “only 40% as likely to report respiratory symptoms as users who do not vaporize, even when age, sex, cigarette use, and amount of cannabis consumed are controlled.” Another study found vaporizers to be “a safe and effective cannabinoid delivery system.”
A 2007 study by the Canadian government found cannabis smoke contained more toxic substances than tobacco smoke. The study determined that marijuana smoke contained 20 times more ammonia, and five times more hydrogen cyanide and nitrogen oxides than tobacco smoke. In spite of this, recent studies have been unable to demonstrate a direct link between lung cancer and frequent direct inhalation of marijuana smoke. While many researchers have failed to find a correlation, some researchers still conclude that marijuana smoke poses a higher risk of lung cancer than tobacco. Some studies have even shown that the non-intoxicating ingredient CBD found in marijuana may be useful in treating breast cancer.
Cannabis use has been assessed by several studies to be correlated with the development of anxiety, psychosis and depression, however, no causal mechanism has been proven, and the meaning of the correlation and its direction is a subject of debate that has not been resolved in the scientific community. Some studies assess that the causality is more likely to involve a path from cannabis use to psychotic symptoms rather than a path from psychotic symptoms to cannabis use, while others assess the opposite direction of the causality, or hold cannabis to only form parts of a “causal constellation”, while not inflicting mental health problems that would not have occurred in the absence of the cannabis use.
Studies have also shown links between heavy long-term use (over five joints daily over several years) and incidence of heart attacks, strokes, as well as abnormalities in the amygdala and hippocampus regions of the brain.
