Angry Note from Neighbor

Today I got another complaint from a neighbor of mine. He doesn't like the fact that my room emits smoke. He hangs his laundry on the balcony so he wrote to us saying that our unhealthy habit is making his clothes stink.

Right now, I have two smokers in my apartment, and they both ignite their tobacco under the kitchen fan several times a day. I'm not exactly sure where the fan is blowing all the air out, but it's strange that all the fish we cook doesn't seem to bother the guy...

Last time we called the apartment manager about it, and he simply advised us to ignore the complaint. On both episodes our neighbor left the note unsigned, so it's hard to tell who it really is. He could've at least left his email address... Is it really worth the effort to complain knowing that you won't be getting any angry feedback? Where's the fun in that!