toke (n.)

"inhalation of a marijuana cigarette or pipe smoke," 1968, U.S. slang, from earlier verb meaning "to smoke a marijuana cigarette" (1952), which is perhaps from Spanish tocar in sense of "touch, tap, hit" or "get a share or part." In 19c. the same word in British slang meant "small piece of poor-quality bread," but probably this is not related.