how often can I use weed w/out permanent adverse effects?

i checked the rules and think this should be okay but please remove this post if it does not adhere to guidelines!!

I am a fairly new user (first time was about a year ago when I hit my friend’s cart a couple of times). Since then, I’ve gotten high about three or four times, but super irregularly since I didn’t have access and would just smoke sometimes when I was with a friend.

Recently, I got my hands on some edibles and am wondering how frequently I can take it without causing permanent brain damage/ adverse effects. Weed helps a lot with my anxiety and depression but I’m also a very ambitious person and don’t want substances to prevent me from reaching my full potential academically or otherwise (I’m currently waiting on Ivy League decisions! I’m 18 currently and only take around 5-15 mg fora really good high.

I’m planning to keep usage to no more than once a month, but wanted to ask more experienced users for advice. Should I be doing it even less, or is this safe?