This basically dictates that you may have certain beliefs that you communicate to the general public that may conflict with a certain addiction you have. For example, you could write a book on how to stop smoking cigarettes, but you too still smoke cigarettes. This is not the same as hypocrisy. This is the addict exception. In other words, if you do not believe in the action but you still do it because you are addicted to it. So basically, you may do it, but that doesn’t exclude you from educating about it because if you were to look at it from a 3rd party perspective you
You could also not necessarily be addicted, but you have done something in particular substance or do some particular substance but that doesn’t mean you don’t know about it. If you know about it, you can still educate others about it.