Seriously brow same thing, I'm 20 yrs old and been puffin' since 17 = 3 years now. Did shitty all through high school. Last semester in College pulled a 4.0, puffin' everyday. I have the same question like is it going to make me dumb or not, I really don't think it has slowed me down at all, I actually focused and did better. As long as you keep your shit up and don't become too lazy you'll be good. Smokin'n doesn'taffect the brain at all, I researched heavily the topic and you body actually produces cannabinoids, when you smoke it just activates them to produce more and that is why you fell high when you smoke. Keep puffin' and you'll do well just know how to maintain it. Seriously I puff around 3-5 bowls a night after work, school & homework and on the weekends seriously lik 6-10 bowls all day of kInd Bud so...its all good

Peace, & Never Stop