1 Judge not, that ye be not judged. Yes, there are some things that are dead give always, like claiming to not believe, or professing Satan. But really we all make mistakes, and if you catch us at the right moment you would see something for an instant that would make you think we are pagan. If someone smokes, or has other addictions, that does not mean they are not saved. It just means they have not given authority to Jesus to that part of their life, or it may be in work by our Lord to be removed.
Some people lose addictions faster than others.
That does not mean they are any more saved or mature than anyone else. It just means that they have gotten that scripture into them. Remember, the Lord is working with us. We are the clay and He is the potter. That means we are not a finished work.