"It isn't illegal to be high on cocaine or crack, it is just merely illegal to possess it."
Not quite accurate. There are a couple of states that have an "Internal Possession Law." If you're high on pot. coke, heroin, whatever, you can be charged and convicted of internal possession.
I forget which states that are, but maybe someone on this site might be from one of the states and can "fess up".
Paul B.