I'm a teen too, so I kinda, KINDA, know how you feel. I put kinda because I really don't date because I'm mostly a tomboy. I recently just rededicated myself to Christ after going through a lot of things and getting back on track. Now I have friends to deal with who have about the same problem as your boyfriend. Right now, I'm just telling them that they shouldn't smoke and drink because it kills you. I have had family members die from it. After a few weeks of just telling them they shouldn't and just being nice and there for them (like being their Jesus) I've had a few come up to me and ask why I was so different. My school (and town) is small and everything gets around quickly, so when I'm being nice to everyone, it gets around. My town also has a problem with kids getting pregnant out of marriage, drugs, drinking, etc. and I'm one of the few who doesn't do that. I explained to them that I have Jesus and that's why I was different. I brought one to Christ, but I'm currently working on the others. So, my advice/ opinion is to just tell him he shouldn't do it, but don't push it too hard, and just be his "Jesus". He may not even know about Jesus.
I talked to him a few month later to learn that he had got closer to the Lord and told me he has been going to church more and I felt like i saw a change in him! I later thought that it was NOT in Gods will for me to date him, I wanted it to be in his Will. The reason I had so many problems with this situation was I was living MY will and not Gods. Maybe you can help him get closer to the Lord but also make sure to pray for Gods will and not yours. The best will come out if you live in Gods will and ways.
