I've enjoyed a number of South Park episodes, but this one is pure BS!
First of all, smoking in public does not in any way, shape or form raise a question of "tolerance"! Putting up with someone else's cigarette smoke is not being "tolerant", and no one should have to do so. It is an insult to true issues of tolerance to allege that likeness.
They make a statement that no "hard" evidence has ever been found that anyone has died from second-hand cigarette smoke. If we can assume that their statement about evidence actually is true, that should not be such an unlikely situation, as such evidence would be pretty much impossible TO gather. What certainly has not been proven is that no one has died from second-hand smoke!
At any rate, what is self-evident is that cigarette smoke is damned obnoxious to be around, and is certainly not something that anyone has a "natural right" to produce in public places. Furthermore, smoking should NOT be equated with unhealthy eating habits, which will harm the perpetrator, to be sure, but does not get inflicted on those around them.
And this doesn't even address how blatantly unfair it is to suggest that Rob Reiner would try to kill a child to promote his point of view. How clueless have people become that they think a "good satire" is worthwhile in the face of its damaging falsehoods?