I don' t know about the smoking thin, I'm a smoker and want to quit someday too.
Gonna throw alittle question or warning in here, hopeing I misunderstood what you wrote about your husband saying "he doesn't want to get back on them (drugs) the way he was before". Once an addict, always an addict. If he thinks he's going to be able to use occasionally or recreationally, hes in for a rude awakening. And the withdrawels and PAWS will get worse each time. I hope if he gets clean this time, that it will be his last time. Good luck, wishing you the best.
Magi