I think she shouldn't smoke anything. I don't want her to fuck up her vocal chords. And anything that you smoke IS bad for your vocal chords. We all want her to sound good right?
It's understandable why some fans are against her smoking due to the health risks and such but at the end of the day it is her choice and she obviously believes in that choice do so. Sure voice your opinion on it, but don't spread hatred among others.
Everyone apparently does it these days. I don't agree with it. I am cool without smoking, drinking or having sex. I find it weird that my idol does it though. But that's her choice, not mine.