You submit facts about other people that happened in the past (i.e. statistics). That only applies to the addict as a prediction.
No. It is a fact that meth use has harmed many other lives in the past. And while that's a good predictor, your prediction can easily be wrong.
For all you know, this addict has access to leading edge medical tech that eliminates drug effects, or has Bill Gates as his Godfather, who can give him the world's best rehab and a job. But never mind how or why, this addict's path is not carved in stone.
So, would you offer any advice to say a loved one who was addicted to a potentially destructive substance?