Anecdotes also lead to me knowing multiple people who've smoked cigarettes for decades without even a scratch (or burn), but that doesn't take away from the fact that we know statistically it's likely to cause serious health problems.

I don't know much about the subject you're talking about, and am definitely not trying to argue that it has the same risk as smoking 20 a day - just making the point that research rather than anecdotes is the best way to judge these things.