What makes introverts, extroverts, and those in-between passionate for cannabis?

Over the years, cannabis has been a symbol, pretext, fuel, or uniting force of many different subcultures: hippies, rockers, rappers, artists, activists, creatives, intellectuals, loners, party animals, and probably many more. It’s hard not to notice that those are some very different groups of people, some even borderline opposites.