Here are some tips that might help:

Don't judge your partner by their habits. First of all, it is important to understand that bad habits are different for each person, and that they can be caused by different factors. Don't judge your partner for smoking, drinking, or using drugs. Instead, try to find out what drives him into these habits.

Discuss your expectations. Talk to your partner about what you expect him to do about his bad habits. Make sure you agree on what habits you don't like and what steps you're willing to take to help him get rid of them.

Look for compromises. Instead of trying to force your partner to give up habits, try to find compromises. For example, if your partner smokes, you may be able to agree that he only smokes outside and not inside the house.

Support your partner. If your partner is trying to quit bad habits, then it is very important to support him in this. Praise him when he takes a step in the right direction and help him overcome difficulties on the way to breaking the habit.

Don't forget about your health. Ultimately, you are responsible for your own health. If you think your partner's habits may be negatively affecting your health, discuss this with your partner and consider changing your lifestyle.