I think its one of those anti-poser aimed barbs...as in many people get a snorkle for looks/Graduate from the Barizon School of Offroading, etc.

It may also be a reference to hood scoop intakes, where a lot of cars have fake ones...and the extra wind resistance of the fake scoop reduced performance.

Some types of mushrooms contain alkaloids that can react with the human nervous system.

His mom may have been frightened by a snorkle when he was a fetus...

Could be a few things really....