I couldn't find that much but I found the same question as yours and this is another person comment. :3 hopefully that help :D
A diet that can lower your stress looks like something with a lot of fruits and vegis. Making sure you get a least one hour of exercise a day. Plus drinking tons of water and a some juices. Foods I'd consider would be pineapples, strawberries, bananas, cucumbers, carrots, and etc.
You inhale when contracting muscles and exhale when finishing a rep.
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.