The few times I've had access to both at once, booze has tended to have a much greater effect than weed.
The other possibilities were a) it was really a non-intoxicating species of moss or b) the other smokers were total lightweights.
( The Mock TurtIe ™ --- Thinks you are a cunt, on, Mon 29 Jun 2009, 3:12, archived)

Oh bugger, we're similar in that respect.
It has fuck all effect on me too.
( Dave Trouser ; the people's choice - 75% agree, Mon 29 Jun 2009, 3:13, archived)