LIFE magazine has this terrific gallery of Famous Literary Drunks and Addicts — and it holds a few (though not many) surprises.
By far “alcohol” is the most popular form of addiction here (although for Ernest Hemingway they call it “booze”).
But you’ll also find heroin (William S. Burroughs) and speed (Ayn Rand) and opium (Louisa May Alcott) and cocaine (Stephen King??).
And, for Hunter S. Thompson, they say “Everything.”