"Hero" is in the title field and the discusion has at times veered into what constitues a hero.What does this have to do with Lady Gaga?
The general answer is up to each individual and how they view the act of heroism and the person involved.
For me, someone with as drug habit(depending on the drug) shouldn't be considered a role model.
However, depending on the situation and act it's possable I might consider them a hero.
YMMV.
Are all heroes role models? The guy who risks his life to save another is a hero. But is he a role model outside of that act? Does he act in such a selfless manner in all aspects of his life? I'm not sure you can conflate the two.