CANCER - RISK ASSESSMENTS - CANNABIS VS TOBACCO
Of course, there are many other theories as to what does cause cancer, but if this is true, it is easy to see why no case of lung cancer resulting from marijuana use alone has ever been documented, because tobacco contains much more of this substance than cannabis.
Science & Research
Undated - News ~ So, you thought it was the tar that caused cancer?
2008 - News - Cannabis Smoke and Cancer: Assessing the Risk
2008 - Study ~ Hypothesizing that marijuana smokers are at a significantly lower risk of carcinogenicity relative to tobacco-non-marijuana smokers: evidenced based on statistical reevaluation of current literature.
2006 - News - Marijuana Smoking Found Non-Carcinogenic
2006 - News - Blunt Smokers Link Dependence Potential To Nicotine
2005 - Study - Cannabis and tobacco smoke are not equally carcinogenic
2005 - News - Smoking Marijuana Does Not Cause Lung Cancer
1999 - News - Why Doesn't Smoking Marijuana Cause Cancer?
1994 - News - Marijuana Less Harmful to Lungs than Cigarettes