Marijuana Damages DNA And May Cause Cancer, New Test Reveals: "There have been many studies on the toxicity of tobacco smoke. It is known that tobacco smoke contains 4000 chemicals of which 60 are classed as carcinogens. Cannabis in contrast has not been so well studied. It is less combustible than tobacco and is often mixed with tobacco in use. Cannabis smoke contains 400 compounds including 60 cannabinoids. However, because of its lower combustibility it contains 50% more carcinogenic polycyclic aromatic hydrocarbons including naphthalene, benzanthracene, and benzopyrene, than tobacco smoke.”
The authors added: “It is well known that toxic substances in tobacco smoke can damage DNA and increase the risk of lung and other cancers. Scientists were unsure though whether cannabis smoke would have the same effect. Our research has focused on the toxicity of acetaldehyde, which is present in both tobacco and cannabis.”"
This is an important issue. While scientists agree that the psychoactive components of marijuana are harmless, SMOKING REEFERS is very likely to cause cancer. The idea of medical marijuana makes no more sense than it would to prescribe tobacco smoke for people in need of nicotine.
To be sure there is a recent study that failed to find the expected link to lung cancer. Unfortunately, the way epidemiology works a failed experiment never proves something is not true because there are always unknown potential variables. E.g. in the study here the numbers of people who did not smoke both tobacco and reefers was small. In contrast the evidence that the chemicals found in reefer smoke cause cancer is overwhelming.
My best advice is if you need MJ for nausea or some other medical use, get a script for the legal version of THC