SWIM and his brother and amsterdam

[Fantasian]

Quick background:
SWIM has two brothers "L" and "A", L is 30ish and A is 18ish.

SWIM's older brother "L" is getting married and having the stag weekend in amsterdam, all of "L's" friends smoke large amounts of weed as does L so dealing with the much stronger Amsterdam weed isnt a problem. SWIM is a little worried because although he smokes occasionally he doesnt inhale the huge amount that L does, but SWIM thinks he will get by.

SWIM's problem is he wants to look after "A" his little brother, is there anyway to dramatically increase the tolerance of cannabis or negate it's effects somewhat so that "A" would be able to smoke like "L", SWIMS experience and knowledge of Marijuana is some what limited. Or could someone offer a suitable alternative except the obvious "Not smoking, or not smoking as much."

Thanks for your time