It think it can't be said that all are one way or that they aren't at all. I mean, if there are these misconceptions is because of some scandals that have happened in the industry.
It can't be denied that some models are chosen because they are naïve and young, and so they are like that in every aspect. Also, they are teenagers and they are way from home, so they don't have their parents control and can be influenced more easily. I mean, when I was 16, me and 49 of my high school mates went on a trip with the teachers, and of those 50, we were only 5 the ones who didn't smoke, drink. And it was only one week away from home.