I graduated with a software engineers degree , ive learned that yes all drugs ive taken throughout the years (weed,benzos,opiods,alcohol,methamphetamine) they all efect your brain in a way that makes you lose motivation unable to focus in classes and always forget things, the right balance i have finally been able to do through my studying years is to stop using all drugs in weekdays and only have 2 days in the weekend to do whatever the fuck i want, believe me this is the best balance for a student , some people will say i can do this and that in weekdays and get good grades well , they can do it but why should i suffer whoever says he can balance studying and drugs daily is suffering with lack of motivation and focus so what do you chose the easy way or the hard way ? , so as i mentioned above the secret is to use 2 days only on weekends it will become a habbit beleive me i never thought in my life i can stop my everyday usage routine but its all in your mind