[header] How to complain about secondhand smoke in apartments [title] Have friendly conversations with all of your neighbors. [step] Not only can talking to your neighbors help you figure out where the smoke is coming from, but you also may find out that you're not the only person having trouble with secondhand smoke in your apartment. [substeps] Begin by asking the person if they smoke. 
If they say they don't, you might say " have you noticed any secondhand smoke coming into your apartment lately? I've been having a problem with that. " if they do smoke, ask if they smoke in their apartment.