What did the author become dependent on while attending college as noted in the memoir, All Boys Aren’t Blue: A Memoir-Manifesto?

In his descriptions of his first year at college, the author describes becoming dependent on marijuana to ease his anxieties. It became something of a crutch, something he relied on to deflect his feelings instead of actively dealing with them. As he entered his second year, he says, he reduced his marijuana usage, and so became abler to deal with himself and his circumstances as his live changed.