While we're "comparing" pot to tobacco and alcohol I think it's even more poignant to compare it the drugs that are legal right now. Have you seen a commercial for some of these prescription drugs? If you live in the US of course you have, it probably constitutes half the advertizements we see when trying to watch a sports event. In addition to "Big Drug" trying to convince America that we're all sick as hell and we'll never get a hard on, these drugs will just kill you slowly. Let's consider the side effects of Cialis, Flomax, Levitra, and every other "I refuse to accept I'm getting old" drug:
Headache, naseau, blurred vision, increased heart rate, fatique (but rarely fainting!), irritability, cardiac arrest, etc...
Side effects of Marijuana:
Kinda hungry. As a matter of fact, smoking a little pot cures most of the side effects of all these shittly legal drugs!