It's a very weak argument. A more potent side-effect would be the subversive influence of smoking imagery. (though I don't put much value it that either, but it's more plausible than yours)
Wikipedia is very biased. Not enough points to the contrary is given.
Haha, great logic.
"Well this is bad too but nobody is doing anything about it!"
That doesn't mean smoking is just fine and dandy. Second hand smoke kills. It's a fact. There is no other side of things. It's a cold hard, scientifically proven, fact. There's no argument to make. If you think smoking has any benefits that outweigh the negatives, you're kidding yourself.
Oh and for your information, we are doing something about car exhaust. Notice the small shift towards Hybrid cars going on in the world? Whether or not people choose to adopt them is a different story. The majority of the world still chooses to be ignorant towards issues like car exhaust just like they are towards smoking.