the drug that seals him off from everyone
It made his thoughts jut out crazily in jagged directions and made him stare raptly like an unbright child at entertainment cartridges
Context
Marijuana-thinking rendered as involution: thoughts jutting in jagged directions, the mind turned so far in on its own sagging self-consciousness that he has forbidden himself the company of any other person while high. The substance does not open him to anything, it walls him off, converting a life into a sequence of vectors between bedroom, refrigerator, and toilet with the blinds down and the phone message set to unreachable. The high is a hermetic seal.