I can smell it in my living room and bedroom, where DD (5 months) is sleeping. We're fairly new in the stairwell, as are they, and don't want to get off on the wrong foot. This is the second time this week. Have noticed it before too, but I'm hoping it's not going to become a regular occurrence. They're not students but a DINKY couple. Normally I'd say they can do whatever they want in their own home, but I really don't want my home to smell as a result of that.