thats how i was taught, i thought it was just common ettiquete, the only other person i find around me that does this are girls, girls are terrible.
i dunno, id be pretty bent too, with girls i can let it slide sometimes as long as theyre not bitches, but with me a keep a small pack of friends, and if youre not in it, you usually dont smoke with me in the first place. so i guess i kind of screen the idiots out, but if i did have one, i think it would be wiser to educate them, because they just probably have never had it pointed out to them before