Marijuana can cause many harmful effects. There has never been a major test though. The ones they've used have shown very different things. I have been very surprised by what I have been reading. I cannot believe the difference in what different scientists think.
             One says, "It's hard to know for sure whether regular marijuana use causes cancer. But it is known that marijuana contains some of the same and sometimes even more, of the cancer-causing chemicals found in tobacco smoke. Studies show that someone who smokes five joints per week may be taking in as many cancer-causing chemicals as someone who smokes a full pack of cigarettes every day." While in certain places it is legally perscribed to people with many different types of cancer.
             The New scientist says, "A FRENCH government study has heaped fuel on the debate over the safety of cannabis by listing it as the least dangerous of all potentially addictive drugs. It also concludes that alcohol is among the most dangerous.
             The study, commissioned by French health minister Bernard Kouchner, was carried out by a panel of 10 French and foreign scientists headed by Bernard-Pierre Roques of the René Descartes University of Paris. The panel searched the scientific literature for information about psychological and physical dependence, neural and general toxicity and social hazards such as aggressive behavior caused by various legal and illegal drugs. The team then grouped the substances into three categories of dangerousness. Cannabis was the only drug put in the least dangerous category. While cautioning that no drug they assessed was "completely free of danger", the researchers gave cannabis a rating of "weak" for social hazard and addictiveness, "very weak" for general toxicity and zero for neurotoxicity. In the most dangerous category, they included heroin and other opiates, and cocaine. Alcohol was also placed in this category because of its stro...