Is there a basic difference between the illegal instrumental use and the illegal recreational use of cocaine?

Is there a basic difference between the illegal instrumental use and the illegal recreational use of cocaine? Is there a difference between the legal instrumental use of a psychoactive prescription drug (obtaining a prescription from a physician for a medical or psychiatric condition) and using the same controlled drug instrumentally, but without benefit of a prescription? Post should be at least 300 words. Respond to at least two of your classmates’ postings by Day 7.