I am feeling sick enough today, thank you very much, that I do not need your cigarette smoke drifting into my apartment through the bathroom vents. I choose not to smoke, nor to be around people who smoke. You are not supposed to smoke in our apartment building. You are told to smoke outside on your balcony. Smoking in the bathroom affects more than just your lungs.
Stub it out.
I wish I could vomit through the vent so you would get hit with it.