<human>: My So (M/30) and I (F/30) have been dating for a little over 6 months.  When we first started dating we discussed how we both used to be smokers.  For the first month, we began smoking together.  While obviously unhealthy, it was our little thing while we talked and got to know each other.  Both of us stopped at the same time. At this point, he was living about an hour away. 

Since then, he has moved about a mile away and I stay at his place about five times a week.  I have total trust in him.  This morning, he had to leave for work early.  I opened his nightstand and found a pack of cigarettes at the bottom, opened with about half left.  I can't help but think he still smokes on the nights I am not around. 

While I don't like the idea of him smoking at all as we both agreed to stop, I could deal with it if he wanted to occasionally.  My issue is that I think he is hiding it from me, and, therefore, lying.  It makes me extremely uncomfortable that if he can keep this from me I have to wonder what else he is keeping from me.  And I can't confront him since I probably (admittedly) shouldn't have been in a position to find them anyways.  Am I overreacting?

Summarize the given text in a few sentences.
<bot>: I think my boyfriend is hiding from me that he still smoked occasionally which makes me wonder what else he could be hiding from me.