What should she do about her neighbor’s smoking?

What should she do about her neighbor’s smoking?

“I recently had a new neighbor move in and she’s a chain smoker. Our lease agreement states that we’re not allowed to smoke inside our apartment, so multiple times a day she stands on her porch and smokes. I hate the smell of cigarettes and breathing it in makes me cough like crazy. I can’t leave my window open without it coming into my apartment. What should I do?”