A common question asked of me is can they quit smoking cigarettes but continue to smoke marijuana. My answer to this is no. Smoking marijuana is no different to smoking tobacco.
Any form of smoking after you have stopped smoking cigarettes is just a trigger to start smoking cigarettes again. Smoking marijuana involves the same sort of breathing and often the same physical hand motions involved in smoking cigarettes, all the same triggers.
My advice is that if you are smoking cigarettes and marijuana then be prepared to give them both up. If not it is like giving up on half a habit. A sure way to start smoking cigarettes again.