How can you help your spouse or partner cut the bad habits out of his life,like smoking, drinking alcohol and other more ?

First some questions: does he want to stop these things? Did he do them before you had a little one? Does he do any of this around your kid? If he doesn't want to stop, isn't harming your kid and was doing it when you got together, its hard to get him to stop now. Ask yourself: why do you want this to happen, especially now? In answer to your q: you can ask him to stop and this will be gradual thing which cant include anger or nagging - but it may be tough.