The risk of lung cancer increased8% (95% confidence interval (CI) 2–15) for each joint-yr of cannabis smoking, after adjustment for confounding variables including cigarette smoking, and7% (95% CI 5–9) for each pack-yr of cigarette smoking, after adjustment for confounding variables including cannabis smoking. The highest tertile of cannabis use was associated with an increased risk of lung cancer (relative risk 5.7 (95% CI 1.5–21.6)), after adjustment for confounding variables including cigarette smoking.
http://www.ersj.org.uk/content/31/2/280.short

Lung cancer is bad, you say? Marijuana smokers are 5.7 times more likely to develop lung cancer than non-smokers.

This post was edited by bentherdonethat on Jun 18 2012 08:12am

From what I gathered in that article, they seem to be claiming that cannabis smoking is associated with an increased cancer risk but aren't claiming any causal relationship.

"cannabis smoking (defined as lifetime use of ≥20 joints) was not associated with a significantly increased risk of lung cancer"

http://www.ersj.org.uk/content/31/2/280/T2.expansion.html

"the lack of detailed smoking histories and the custom of mixing cannabis with tobacco may have contributed to the risks observed."

"A positive relationship between cannabis use and cigarette smoking was observed in the controls"

Also, you don't have to smoke cannabis

This post was edited by Derkaderk on Jun 18 2012 09:45am

They didn't control for the quality of the wrapping or for vaporizers I bet.

are you stupid
marijuana defintely messes up your body...
you wont notice it now but after 20-30 years of smoking you turn like a crackhead
get lazy
and your dick going to break

im sure all those things happened to you
and i feel for you
but ......

afaik, you cant od with grass but you can with mdma

Pure MDMA is really rare compared to Ecstacy, which combined it with other drugs.

Pure MDMA is still nuerotoxic i believe but it's very minimal. MDMA is safe if used responsibly. I would still definitely have to say that marijuana is less harmful though because it's not really harmful.. at all..