I totally agree with what Falloutgirl said.
I mean.. we don't know how much Adri smokes.
And honestly I don't think we ever will. I don't really like it when people say 'I read somewhere that she...' because I tend to not believe it. It just seems like it's something that they are personally convinced is true. I don't remember ever reading anything that discussed Adriana's smoking and I think that, like all of us in this thread, I've read every article on the web that even mentions Adri.
Smoking is bad for you, but many people still do it. As much as we may want to think that Adri doesn't do it there is proof that she does; or at least used to.
Oh and I also think that that entire argument over whether or not people look like Adriana got very pointless... especially near it's end.