When Bruce Grayson is brought to the hospital to treat his overdose, his pusher, Manny, tries to force Dr Rex Morgan to inject the helpless dope addict with enough drugs to kill him.
Morgan manages to overpower Manny and his stooge...
This story, which appeared in Harvey Comics Library #1 (1952), was written by Nicholas Dallis, and illustrated by Marvin Bradley & Frank Edgington, the creators of the Rex Morgan MD newspaper strip.
(In fact, the story was originally published as part of the strip's continuity in newspapers all over the country before being reformatted into a comic book.)
Though meant as a cautionary tale, it was vilified by Dr Fredric Wertham in his book Seduction of the Innocent and lumped with horror and crime comics as one of the causes of juvenile delinquency!