I live in an apartment building and a new neighbor just moved in next door. He must be a smoker because I smelled it right after he moved in. First, just in a bathroom and around the hot water heater. Now, when I run the a/c unit, I smell it all over. It's that second hand stinking smoke smell. I have asthma and I hate the smell. Any advice? Would a air purifier help? It's just not fair that I have to smell someone else's smoke. I feel like putting some literature about it on his door. Thanks for any help.