I remember when there was a huge push on reddit and everywhere to decriminalize and later legalize marijuana and I was a supporter of the movement and still support it but only as a liberty principle. After getting into smoking it regularly in college I had the chance to meet long time users and without exception all of them had cognitive issues. One day I was late for a party and everyone was high when I arrived and I realized that I simply can't stand them because everything they said was the lowest IQ stuff I ever heard and they were pretending that its creative. Quit the thing and never looked back.
Stick to the alcohol and drink within the culture of it and you will be fine. It is bad for your body even at small quantities but at least you keep your mind intact and alcohol actually enhances the creativity by lowering your guard and not interfering with your intelligence. The culture part is important, binge drinking can be fun at college at times but the culture I'm referring is the culture where alcohol is being consumed socially together with some food or at event. Avoid drinking alone and other high risk activities associated with drinking.
I keep reading about how alcohol consumption is dropping, pubs are closing and this makes me sad because I see how young people lock themselves into apartments and smoke weed all day. I don't believe that anything good comes out of it, no wonder the loneliness epidemic is destroying the world.
It's a very unpopular opinion and in some countries drinking only means getting smashed but trust me, there's another way. With weed, there's no another way.
Anyway, here's something fun to watch on the topic: https://www.youtube.com/watch?v=VTSCppeFzX4