It's not the comfort, it's because he was suffering withdrawal. If he wants to
stop he has to
taper off. There are many reasons to
stop, but if one of them isn't that the person is cured, then the person still has what he had before. If he has true psychosis, there is currently no cure. If it's depression or anxiety and therapy has worked, then yes, you can stop and not just get whatever you had before.