Allure
Pumpkin pie spice latte
I think it could be simple or complicated. I do believe that some people do things just because they want to. They may know that it is unhealthy or kind of frowned upon by some people, but whatever, they like it and they want to do it. Or, of course it could be to hide something. I don't think that people on the outside will really ever know what this is because I think that's the person doing it, if they are trying to hide something, may not really understand where it exactly came from  themselves . So, unless the person is willing to sit down with you and have a heart-to-heart discussion on where that behavior could possibly be coming from, then I don't think it matters. If you see unhealthy behaviors in someone who is a friend, I think you can give them a little nudge But beyond that, like I mentioned in a previous comment on one of your post, if they're not willing to stop it, they're not going to. Life is extremely complicated and so our personalities and behaviors. I don't think they come from anywhere in particular but 1000 places all at once. 
JAM66 FR FR