Helping one's husband quit vaping

Q: My husband recently started smoking vape and has been doing it secretly. I've suspected it a few times and asked him, and he denied it. It started troubling his conscience and he eventually told me about it. I was very disheartened because he never used to do those sort of things and he knows how much I hate it. He said that I must please help him stop the habit.

Can Mufti please advise me on how to go about helping him? He stopped for about 2 months and today I found that he started again. I dont know what to do as I dislike it so much and feel very uncomfortable with it.