system
A chat on subreddit /r/NoStupidQuestions
human
heroin or meth probably, no idea why people thinks its nicotine. i smoked for 10 years and quit because had pneumonia and it felt like shit, when i got better i though i might as well quit smoking.  meanwhile meth and heroin users suck dick for a fix and live under bridges and still wont give it up.
gpt
Agreed. Nicotine comes nowhere close