Here's my opinion. I started smoking at 14-15 and started smoking daily at 17 and still going strong to this day. I smoke depending on the day and my schedule.
What you are doing right:
Smoking AFTER uni
Smoking because of anxiety/depression (depends who you ask rather this is. Good thing)
My opinion is that people smoke and smoke and smoke and eventually they aren't smoking for depression, but rather smoking because they are 'bored'
That's what happened with me. I found myself smoking just to try it, then started smoking more because I surrounded myself with people who smoked all day and felt "semi-depressed/bored", and now that I don't hangout with them anymore because I'm so busy, I find myself smoking because, well, I have some to smoke. And if I don't I go buy a g-2 (don't like keeping large amounts on me).
The problem with ME is that I'm smoking because I'm bored, and that makes me kinda depressed because I should be smoking to "have fun!" Or just to relax if I had a bad day (and sometimes I do).
Look, everyone is different, but here's my advice
1. Spend only about 10%-15% MAX paycheck on bud
2. Try to smoke only from Thursday-Sunday
3. Try to find friends to smoke more with, that way you can smoke for "fun" and have a good time
4 for depression and anxiety, try smoking a little if you feel those urges come, but put a stick note on your PC that says "if I smoke when I'm depressed, I'm just finding a sensitive, if I'm depressed and I don't smoke, I am strong" or something like that. Don't feel like you are under its thumb
I'm not saying you are weak, but I would hate to see someone start smoking more and more and more NOT because they are a weed loving person who is just genuinely fascinated with the culture, medicine, and life style, but because they are trying to 'treat' something
Yes, weed helps depression. It helps mine and it does help anxiety (but it also makes me paranoid as fuck sometimes), but there are better means
Bottom line: you will be MUCH more happy if you stopped smoking weed for your depression, and started smoking weed to make your already amazing day better
Not trying to tell you to just randomly stop being depressed, but try to change your lifestyle one step at a time until you find that you aren't depressed or just bored all the time, and that will not only help you emotionally and physically, but will also make the weed you love to smoke that much more enjoyable!
IMPORTANT: most people your age, especially ones who are in college, go out, get drunk, fuck up, act crazy, etc, etc... You seem like a nice person, and I do think there is a divide in the type of people who smoke.
1. There are the fun loving people who like to smoke, are chill, and try to share experiences with others through the herb and what not and even trying to smoke because they want to relax and treat anxiety (like cigarettes)
2. There are douche bags who hop on this bandwagon, get stuck, resort to a "thugish" lifestyle portrayed by the music industry with smoking that makes them think they are somehow superior and cooler for smoking
3. then there are some who are both
Try to be the first of these, and I think you will find your way in life and around "addiction" (not technically addictive to your body but people do fall into patterns that can effect there life choices, trust me it seen it).
Don't sweat it.. You are young and have a whole life in front of you. Soon you will be making bank after Uni, have a family maybe, hanging out with friends, and responsibly smoking weed everyone once in a while, or w everyday if you choose, and you won't feel like it's because of your depression. Trust me. We have all either been through it, or still finding our way out. The good thing about marijuana, is that it lets YOU make the choices, not the other way around.