Nothing really new. When I was in college some 50 years ago, the appetite suppressant Dexadrene (spelling?) was extremely popular during exam week. I believe it's another variety of methamphetamine.
I used to use 120 mg of Sudafed when I was cramming for finals in college, many many years ago. Made me brilliant—but later I didn’t remember a thing I’d studied.
Vick’s inhalers were supposedly somewhat popular until they were taken off the market.