Answer:
Due to the cognitive effects it has. There are peer reviewed studies that show a correlation between cannabis use and a decrease motor and cognitive function over time. It also stunts brain growth in people under the age of 25 since the brain is still growing until then. Also, cannabis is still federally illegal so universities usually abide by federal laws. Cannabis smoking also causes a distinct smell that sticks to things and second hand smoking is still a risk.
Trying to take less stress off buy not doing so much .
