Originally Posted by Libertine

That would be more convincing if you had managed to spell "completely" correctly

Aside from that, no, it's not false. A rather large number of studies have been done on the subject, and although many contradict each other, the prevailing view is that marijuana is not directly linked to lung cancer, but is directly linked to precancerous changes in the lungs, and is also directly linked to a number of other lung-related illnesses.

Basically, smoking and inhaling pretty much anything is bad for you.