so.. wait. you quit smoking 2 months ago and while waiting at the bus stop you just pulled out a smoke from a pack that you carry with you? or did you put in the effort to walk to a convenience store and buy a pack? if so, throw the rest of that pack away
also, who the fuck cares, its only one smoke. its not like youre smoking meth or anything. people make smoking cigarettes much harder than it really is, they look for reasons to be tempted when theyre trying to quit, and they purposefully fall for them. that being said, do whatever the fuck you want, i stopped smoking i duno.. a couple months ago, ive had no problems, but if i decided to have a drag or buy a pack in a few months from now, i wont feel sorry or ashamed for myself, its what i WANT to do. so.. stop looking for empathy, quitting is as easy as you make it.
i will also suggest replacing cigarettes with another hobby, maybe chewing gum, or smoking weed. (hey at least when you smoke weed you feel an effect)
edit: to add