This is a VERY interesting study that shows that heavy pot smokers are not more likely to develop lung cancer than non-smokers!
"People who smoke marijuana do not appear to be at increased risk for developing lung cancer, new research suggests.
While a clear increase in cancercancer risk was seen among cigarette smokers in the study, no such association was seen for regular cannabis users.
Even very heavy, long-term marijuana users who had smoked more than 22,000 joints over a lifetime seemed to have no greater risk than infrequent marijuana users or nonusers.
The findings surprised the study’s researchers, who expected to see an increase in cancer among people who smoked marijuana regularly in their youth."
http://www.webmd.com/content/article/122/114805
"People who smoke marijuana do not appear to be at increased risk for developing lung cancer, new research suggests.
While a clear increase in cancercancer risk was seen among cigarette smokers in the study, no such association was seen for regular cannabis users.
Even very heavy, long-term marijuana users who had smoked more than 22,000 joints over a lifetime seemed to have no greater risk than infrequent marijuana users or nonusers.
The findings surprised the study’s researchers, who expected to see an increase in cancer among people who smoked marijuana regularly in their youth."
http://www.webmd.com/content/article/122/114805