I'd rather just wait and see: it could've been unrelated illness, accident or various other causes, we just don't know. I suppose I do fear a repeat of some of the unpleasantness that followed Amy Winehouse's death: though I wasn't a fan of either, the news was still very sad and many of the comments were uncalled for.
For the record, not all drugs cause irreversible damage, but that's another matter (and no, I'm not advocating them, just to be clear.)
I'm not really sure if I agree with you on the latter part. Alcohol and tobacco, both legal drugs, can be fine in moderation. However, even light use of them causes (albeit miniscule) harm to the body. Inhaling smoke into your lungs is never a good thing, and even a drink solely on the weekend will do a tad bit of damage to your liver.
It was especially unfortunate in Winehouse's case that it was really her death that caused a spike in her music sales. Many people, myself included, weren't even familiar with her work before her death. Of course everybody's interest peaked after her death, and I'm not ashamed to say that I really do appreciate her music. It's just unfortunate that it was her death that caused the interest.