Cannabis does, in fact, contain more carcinogens than tobacco. The problem with tobacco is that it doesn't contain cannibanoids, which have been shown to inhibit the growth of cancerous cells.

Unlocking a Cure for Cancer – With Pot by Paul Armentano
afghooey Reviewed by afghooey on . I hate health class... So in health class were in the drug unit, and everyone knows what that means, ridiculous facts about cannabis! But the one I heard today seemed exceptionally unbelievable, my teacher said that smoking one joint is equivalent to smoking 30 cigarettes. 30! That's a pack and a half of cigarette carcinogens and toxins crammed into one measly joint. It's sad to think how mis-informed people are these days. Rating: 5