Anything we can do about our neighbor's cigarette smoke? It's starting to reek here.

I don’t know what has changed, but our upstairs apartment neighbors’ smoke has started to increase. First the common hallway started reeking and now our living room smells terrible.

I don’t know if there is anything in the lease that can make it stop or if we have any recourse.

If there isn’t, is there anything we can do to make our apartment smell less like an ashtray that is baby safe? I don’t want to spray smelly junk all over the house or use lots of potpourri if it’s not really safe to use around a newborn.