OneOfMany: I dont think that smoking is coparable to chillul shabbos or eating treif but i believe cherrybim may have meant that smoking kills and therefore oiver ‘v’nishmartem m’od’. I am one of those girls, in fact part of the majority of girls, that did not/does not want a boy that smokes. I wouldnt even consider a boy that smokes and would feel very bad about hurting a boy’s feelings that i went out with, without knowing he smokes.
So to the OP, yes, i believe that because so many girls feel its terrible to smoke and dont want themselves or their children to live with the dangers of second hand smoke, it is imiportant to mention. Especially nowadays when covering the scent and hiding all hints of cigarettes are much simpler, girls should be told about it so that heartbreak can be avoided.