In my experience, cannabis addiction is the definition of insidious. I used it daily in high school and college since the age of 15 or 16. The effects on my learning and memory were profound, but I never noticed how bad until I was off it for 1-2 months. I was flunking Calculus, got busted my parents, then my head cleared, I picked up the subject in a month without even studying and aced the AP Calc exam. Same thing happened in college studying engineering, I’d flunk the first exam, decide to quit, then learned the material easily. Most people aren’t trying to learn STEM so it’s probably impossible to tell how bad it’s impacting you. The withdrawals weren’t so bad, just feeling kind of spaced out and weird for one or two months, but it was just hard to quit because you don’t see the reason to. I haven’t smoked much since school, but my memory is so bad now 10 years later it’s sad.