Smoking is gross. Of all the things one can do to destroy their health, smoking is probably the only one that can also injure and/or annoy those around you as well (I guess drunk driving, too, but that takes two combined acts: getting drunk, then driving).
I had a roommate my freshman year who smoked. He made everything I owned stink, too, and he probably took five years off my life.
I do a lot of things that I shouldn't; overeat, watch too much TV, drive 5-15 mph over the speed limit, spend too much time on ATOT, etc. However, I acknowledge that I should not do those things and I make efforts to correct (improve) myself. Many smokers are jerks when it comes to defending their smoking - there is no defense except that you were an idiot when you started and now are hooked. Just admit that it is wrong to smoke and that you would like to stop, but it is hard to do. I can respect that. Don't try to justify smoking.
/rant
MotionMan