Help, High School!!!

okay, so i’m an 8th grader and high school is coming up. a lot of high schoolers are drinking, smoking weed, juuling, etc. i know i don’t want to end up doing any of this, and i think i can face peer pressure. also i’d like to maintain a 4.0 GPA. i love my friends, and i think i’d still be friends with them if they made these bad decisions. but is that bad? i just don’t want to end up in the wrong place! any tips on high school would be so beyond helpful!