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Originally Posted by Street Pharmacist

http://www.hc-sc.gc.ca/dhp-mps/marih...-eng.php#chp72


You have to remember that marijuana smoking risks are not as easily assessed due to the fact that those who smoke marijuana normally not do so as consistently as tobacco users do. Add in the fact that it has been illegal for a very long time and we simply don't have the body of evidence we do for tobacco. It's incredibly ridiculous to suggest smoking cannabis has never killed anyone. If your meaning by overdose, then neither has tobacco. It's the insidious nature of the illnesses they cause that make it difficult to determine.


Here's the things we know and can demonstrate:

1. Cigarette smoke is what causes lung cancer and various other cancers. It's also what causes the lung damage that leads to COPD and other airway maladies.

2. Specifically, it's the various polycyclic aromatic hydrocarbons and other oxygen free radical forming compounds in the smoke that cause these diseases.
3. Burning any organic matter creates these compounds


It's really not a stretch to believe that inhaling smoke of any kind will lead to these health problems. What marijuana has going for it is the fact that one does not consume marijuana to the same extent as tobacco, so it is likely much less harmful. It has killed people and caused cancer

Speculation at best.