Addicted hubby

First off- my husband and I just found out we are expecting a few days ago. We always discussed beforehand how when I became pregnant he wants to quit smoking and stop drinking as much. He really struggles with this and I don't think I can really force him to quit right now. I want him to but I feel he has to make the decision himself. But at the same point I know if I don't see him putting effort into it soon I will start getting very upset and we will argue over it which I don't think will help the situation. Anyone else go through this before or currently are? Anyone have advice on what to do or say? Thanks in advance💕