I am in university for a degree in BA (major in accounting) 1st year. i can honestly say weed has had a little impact on my potential.

the lack of information retention is one important disadvantage as well as the inability to focus when required.

On a high school level, i smoked weed everyday skipped so many classes and still managed to get a 3.0 or 70% average throughout the years.

same does not go for all though, as a lot of my friends have abused weed to the point where it completely destroyed their potential.