I was a professional in the MJ industry for over a decade & have more experience in this area than I sometimes like to admit - here's my opinion:
Smoking weed gives you an altered perspective which can be thought of as "Wow, the little things that I took for granted before are suddenly really DEEP". You notice nuances in your own way of thinking that make you giggle. Music and literature & movies, etc. all seem accentuated and curiously different when you're high.
This however makes you feel self-conscious and SHY. So if your have low self-esteem or lack confidence it will mess you up & GREATLY increase AA and paranoid feelings.
On the other hand, I'm a guitar player & like MANY musicians I find a little MJ makes me "feel the groove" and play more creatively - BUT I don't get high before going out to be social with strangers because it makes me much more self-conscious and SHY, just the opposite of what I want when opening sets!
Alcohol has the opposite effect - it makes you feel BOLD and fearless (careful, too much = obnoxious drunk). That's why shy guys often feel the need to have a couple "shots of courage"...
I completely understand what Fader is saying: Top PUAs can handle smoking a little weed because they have incredible self confidence and skills that are practically on "auto-pilot". Once you get to that level, even though you may not be @ your very best when high - you're still good.
Bottom line - if you want to be SHARP & ON TOP of your game you shouldn't smoke pot while sarging... save that for the end of the night when you're chillin with the HB you brought home.