This is more of a tip for friends of smokers.
Please don't say things like "smoking is bad for you" or "why don't you quit?"
Most, if not all smokers know the effects of smoking and don't need to have the obvious stated. Being lectures like we're stupid is not a helpful technique to get us to quit.
With that said, I am on my third day of not smoking. To keep me occupied I am actually building my own quit smoking website.