How long should i wait to go scuba diving after smoking marijuana?

Till it wears off: Since, from what i understand, scuba diving requires you to be aware of your conditions and be careful of things like remaining oxygen, etc, it would seem foolish to dive high, since cannabis interferes with those kind of functions. I would not call the state that normal use anything like 'schizophrenia, ' except in very vulnerable people, but it's not a good one for being deep underwater either!