What drugs did Jack Kerouac use and What drugs are used in On the Road?

1. He used Marijuana, Alcohol and Amphetamine "Speed" (not meth!)

2. In the movie they use Benzedrine inhalers as they smashed to take out the content.

Benzedrine was an Amphetamine purchased over the counter on the pharmacies during that time period.

they also used marijuana "weed" but what he used when he was sitting on the outhouse did I never realize.