Understanding the risks of buying potentially adulterated or counterfeit products is another thing entirely, which would be helped greatly by increased commodification and legalization.
We often attract certain types of people, and have a wealth of experience with that type.
We probably all take this as obvious knowledge. But only when I uncomfortably enter a group of people unlike me -- and feel totally alienated not just by their norms and assumptions, but their misunderstandings of my own -- only then do I truly confront the implications in a visceral, non-academic sense :)