Weight gain should also be added to the list...the average quitting smoker gains 10 lbs. upon quitting.
Seriously, smoking is bad for you on sooooo many levels it's ridiculous. You get lung problems. You get heart problems. You smell bad. Your house and everything in it smells bad. You have disgusting teeth. You pay loads of $$$ for it. You are becomes horribly addicted to it. You kill innocent people. Uhm that last one is a bit... exaggerated ^^' I could go on with that until next week, but I think you all get the point.
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That said, I will agree with you on saying that it is mainly the older generation that smokes now. The likely cause of this is because the younger people have grown up with knowing the negatives of smoking. Well from where I come I can't see a difference... younger people do smoke here even more than older I think. It's because they think other kids do it too, so it must be cool. Most of them quit a few years after it though. Older people...not so much.