1) marijuana does increase metabolism to some extent, which is particularly noticeable during the 45min to hr after smoking. During this time energy level and even strength are increased! (a bit, we're not talking amphetamine here).
2)the munchies are overblown. During aforementioned 45min to hr, marijuana actually supresses appetite. When it returns, there's a mild homeostatic increase. However, the primary source of the munchy gorge is perception. Just like you think you're the best snowboarder in the world while stoned, you also think you're eating more than you really are.
Is there a take-home message here? Do not smoke until actually at the gym (parking lot if you want to keep your memebership). Put on ipod. Neither talk to, nor make eye contact with anyone. Go to part of gym where nobody else hangs out (squat rack/platform). Lift like quiet, enraged animal. Go home and eat whatever your diet calls for while watching Archer.
Do I have any "references" to back this shit up? um...
"I cannot hear you... over the sound... of my deafening awesomeness..."