This episode reminded me of a bunch of W. S. Burroughs routines, especially the first minute of the Naked Lunch Excerpt on the Dead City Radio CD where he talks about witnessing a "hot-shot hit":
You ever see a hot-shot hit kid?
I saw the Gimp catch one in Philly.
We rigged his room with a one-way whorehouse mirror and charged a sawsky to watch it.
He never got the needle out of his arm. They don't if the shot is right.
That's the way they find 'em, dropper full of clotted blood hanging out of a blue arm hehehe.
The look in his eyes when it hit, kid it was tasty...
It also reminded me of something Burroughs said where he disagreed with Holmes. After having been off junk for over 3 decades, Burroughs said he still instantly recognizes the smell whenever he stumbles across it.