In regards to ignorance, if your view of drug use comes from the popular media then it looks irredeemable. If you have no personal experience of people you know who have tried or recreationally used different drugs you will be seduced by the notion that "there's no right way to do drugs". Indeed, not long ago it might have even be easy to hold the same opinion about marijuana.
The reality is that while some drugs hold the potential to wreck lives, few drugs are worse than those we already grapple with and accept into mainstream culture: tobacco and alcohol. Just as with alcohol it is possible for other drugs to ruin lives, but just as with alcohol many drugs can be used without doing so.