I personally don't really date men who don't do drugs. The closest I've gotten is that I've been on a few dates with guys who only drink alcohol…but usually I can tell from the start that we probably won't be the best match. Drugs are a big part of my life at this point in time, so of course it's going to be something that I talk about a lot. If someone doesn't partake in similar substances (or at least tries to understand them and learn about them), holding a conversation will probably be pretty difficult.
That being said, my current boyfriend loves drugs as much as I do which works out well because I love doing drugs with him. When we met, the only thing we both did was smoke weed and we discovered our love of drugs around the same time (before we started dating). We love to trip and roll together, and it's brought us so close and I feel so connected with him because of it. We've also ventured into a number of first-time drug experiences together, which is always such a bonding experience. He's my favorite drug partner.
As well as that, we both look out for each other and make sure neither one of us is going too deep. And whenever one of us wants to try something new we always talk about it and research it together that way we both know what the other person is getting into. It works out really well.