I did qualify that I'm talking about heavy users but I don't think I'm over-generalizing. Any heavy drug use, or addictive or dependent behavior in general crowds out other things. That's just a fact of substance use.

Occasional recreational use is one thing but people who are high every day, they aren't able to be as present as they would be if they were sober, and in changes them in I think usually negative ways. Not even because of the particular drug they're using, but because of the patterns of behavior that come with those levels of consumption.