Just because one chooses to ingest a substance, doesn't make them crazy. Some substances make some of us more in-tune, aware, and alert. Some of those substances affect others in positive ways, unlike what you were taught to believe. Sometimes, they invoke pure genius.  Dont be so quick to dismiss the guy just because he uses something you were taught not to, and know nothing about. For a great example, look at music... I speak from experience with substances, and I'm a well adjusted successful person.