I have been going out with my girlfriend for a while now, we are both 17 and very happy together. But there's one thing I can't stop worrying about.

I am very against smoking and find it extremely horrible and would hate to see her smoking. She said that she thinks the same about it. But I found out that she tried smoking with her friend once last year. She said that they did it "in her shed". I got a bit annoyed but we talked it through and She said it's the first time she's done it and she hated it. Then she said she has not done it since and won't do it again. This is where I get worried because I don't believe her. I trust her in most things but I always feel like maybe she does it more often with this same friend.

I was recently going through this friends Twitter and she posted that "we know the feeling of sneaking out of the house all too well". I am now worried that maybe she means they sneak out and smoke, like with the shed situatuion.

My main problem now is that my girlfriend doesn't like us getting angry at each other. I don't want to talk to her about it again either because last time she told me she hadn't done it since the time she tried it last year. But I'm very worried because she is the type of girl that does not easily say no, she may give in to peer pressure from her friends that do smoke more often.

The problem is not that she tried smoking, or that she is sneaking out with her friend, the problem is that I do not know if she is smoking more than I think and more that I would ever hope. She is a respectful, Christian girl who I do not see as ever doing that type of thing and me and her think the same on the topic. But I still feel she is giving in to peer pressure and doing it when she meets with this friend and I am extremely worried and do not know what to do.

I would really appreciate some help. I do not need advance on why I should let her smoke, or how smoking is ok, because me and her agree that smoking is disgusting. Thanks in advance!