<human>: So I've been living in NYC with this girl for a bit. She seems alright, we've only had a few short conversations and otherwise I haven't even seen her much. The first time I smelled (cigarette) smoke, I was in my room with the door closed. I opened it, walked into the living room, and she and 4 of her friends were sitting there smoking. I said "Can you guys stop smoking?" One of them said sorry and appeared to put it out. I looked at her and she said "yeah..." after a pause. They then went into her room, and she came out 2 minutes later and said "Sorry about that." The smell went away after about 30 minutes with all the windows open. I hoped that was going to be it.

The next 2 weeks, nothing. Then, tonight, I smell it in my room again. She's opened one window in the entire apartment, and probably doesn't even have the one in her room open because it's cold. I'm not really sure how to approach this. I know the landlord, who also manages the property, but I don't really want to talk to him about this unless I really have to do so. She might not be planning to live here long-term so even if eviction were likely, it might not be much of a threat. I don't really think my feelings about smoking in the apartment are unclear, I'm sure I looked pretty pissed when I asked her friends to stop smoking. We haven't spoken at all since the time I asked her friends to stop smoking, although that's 90% because we barely see each other. How can I re-approach her about this in a productive way?

Can you condense the text into three sentences or less?
<bot>: My roommate and her friends smoked in the apartment, I've made it clear that I don't like it, but now she's at it again.