Quote Originally Posted by psychocat
On the downside : Cannabis when smoked releases more tar than tobacco Fact.

On the upside : Cannabis has been shown to help MS sufferers

It's about benefits v downside.
Just to go along with this: Cannabis smokers dont smoke a pack a day. One good weed joint will satisfy one novice-to-intermediate smoker for an entire day. And theres always vaporizers, which takes care of SO MUCH tar its a joke.
With vaporizers, and the fact that tobacco smokers smoke far more than a stoner would need to, the whole tar concern is basically gone.