Weird stuff that happened to me

16/17 year old teens snorted Effervescent powder

So this story happened to my brother when he was 16/17. He and his friend liked to make effervescent powder cause they both liked sour stuff. And one day they managed to convince two other people from their class to snort it. Their nose was bleeding after that. Oh and one day when my brother had school break he saw them throw a bag of something into bushes as a police car drove by. Turns out they where drugs.