The problem I see with your situation is that you are dating girls that don't share the same interests you have. The real problem is not marijuana, or your feelings for marijuana, but the fact that the girls you allow yourself to fall in love with like something you don't particularly care about. Just because you choose not to date girls that smoke marijuana doesn't mean you are not open, or are close minded, it just means marijuana isn't right for you, so naturally a good relationship would be with someone that shares your same feelings.

If you ask me, you just seem very immature relationship wise, you are thinking of love as some uncontrollable spiritual force, when the reality is that it's nothing more than a chemical reaction in your brain. Every person has full control of who they fall in love with, but many people don't understand love enough to realize this, so instead of choosing a good match to fall in love with, they try to force themself to like someone they have already fallen in love with. This is why the divorce rate is so high for people that get married under the age of 25.

You probably won't like my suggestion, but I'm not here to tell you what you want to hear. You need a different girlfriend, someone who shares the same interests as you do. Marijuana is obviously something that bothers you, so just find a girl that doesn't smoke marijuana, trust me, there are plenty. Maybe we should trade black books, lol.