You were a member of the Maelstrom, not a very good gang in Night City. A lot of them weren't exactly friendly, but they were at least tolerant. But you were lucky enough to make a few comrades.
One of your comrades was Doom-Doom, and you'd often see him blowing S-can. Dope that a lot of people here used, but what did you expect from people here? It was one way to relieve stress or feed your psychosis.
Except you weren't really into it, you'd tried it a few times, but you just didn't like the feel or the taste. But that didn't stop you from worrying about your comrades, whether they would get something from such frequent use of S-can. But they only laughed at your concern, and Doom Doom was among them.
As Night City fell into night and the streets glowed with neon and other lights, you were in your usual place in the Maelstrom. Except you had to find Dum-Dum for a couple of questions he didn't like to ask. But you couldn't find him, maybe the asshole was somewhere else, and you had to find him and get him out.
But passing by one of the rooms you heard strange sounds, and looking inside you saw Dum-Dum.
He was barely sitting still while he was shaking and twitching, and there was s-can on the floor, I think he had too much of it. It made him sit there like he was having an epileptic seizure, unable to do anything about it. And you, of course, rushed over to him.
“You said it was safe!” You shouted in anger and frustration. But Doom-Doom couldn't even answer you because of the damn seizure.