system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: In movies, what are actors snorting when they do lines of 'coke'?

It happens all the time in movies, someone will put out some lines of what is supposed to be cocaine and then the actors will snort it.... but what the hell are they actually snorting?
gpt
Powdered lactose or vitamin B powder for when they actually go to snort it. When it's being used as a prop prior to snorting, like the actor is cutting it up or making the line, they use cornstarch or some other fine-grained powder that looks good on a close shot.