Question about relative sobriety of competition

[Godfather80]

Understand that I'm not complaining, because I'm convinced that most people who are drunk or stoned play worse, but I am curious here. Why do some people consistantly smoke marijuana at the table? I play in several weekly games and I am typically the only one not smoking weed. They all play worse, both in a technical sense of being slow as hell to deal and the like and in the strategic sense of continually checking they're cards on flush draws and the like. So, how 'bout it, potsmokers? What is the draw of being high at the poker table?