//why don't they just quit??//
Not saying you're one of them but the snotty nosed 'quitting brigade' used to make me more determined to continue smoking.
There is no such thing as 'just quitting'. I've been free from the fags for going on 9 years and still think I could easily light one up after dinner, but I don't because it was so damn hard to give up properly. It took a serious health warning to push me far enough to finally really quit.
I feel that smokers that puff outside are considerate and on the increase. I still don't mind peeps smoking in my vicinity, although after smoking they do stink for a while, and a full ashtray smells revolting.