system
A chat on subreddit /r/NoStupidQuestions
human
When you are zoned out due to drugs or passed out because of alcohol, your mind does not dream or go through the regular sleep cycles. Dreaming, processing and purging information, is a big part of maturity. Studies show that people stop maturing at the age when they become addicts, alcoholics.
gpt
No, this is massively oversimplified.

This is a direct effect of marijuana itself.

The opposite effect can be seen when consuming substances like mugwart, which heighten dream vividness and memory.