i had the same problem
i don't smoke weed anymore (though i might be going back on again if all is good) and for about a month after i still had that problem. finally after a month the effect went away.

it is fact that herb can mess with your short term memory. it's all about forgetting this fact using your short term memory loss.

ps what i said about one month may be different for others. i can't guarantee anything :rastasmoke: