Yup it's all about your mentality and everyone is affected differently. I personally have the same problem where I will sit down and toke up in the evening then have to force every fiber in my body to focus on homework and try to accomplish something. It's tough but I know that I need to get it done. One of my good friends on the other hand enjoys doing shit like that blazed lol. He's one of those people who can still keep almost all of their wits about them even right after they finish chiefing but still feel a nice relaxation because of the high. He is a natural born athlete and gets completely stoked on the days when he has a break between school and practice so he can go home and chief haha