I started out the post with "Drugs like cocaine, meth, heroin".
In fact, in many ways, addiction triggered by prescription painkillers and stimulants can be more difficult to deal with. We have gotten fairly good (with a lot of improvement to go) at treating "standard junkies" but people who don't consider themselves to be in that "class" will often fail to seek out treatment because they fear association with that "class".
Basically, the stigmatization of illegal drugs and addiction in general causes collateral damage. The attitude that addiction is immoral or signals some sort of personal defect (more or less, the sort of attitude powertower is showing here) causes harm.