@PotomacBobWhile "intoxicated" can describe being affected by most any mood-altering substance that works through your system, most people will associate "intoxicated" to being drunk on alcohol. Unless it's in a clinical context, readers may get confused to read a character being described as intoxicated from drug use.
Unfortunately I can't think of a formalized term for getting high, but of course there's tons of slang. Marijuana: baked, faded, blazed, lit, stoned, etc. Cocaine: buzzed, blown up, bumped, weightless.
Note that marijuana and cocaine are pretty different experiences, so if you want a character to sound knowledgeable, you may want some discernment.