From Mayo Clinic:

This video explains the effects that marijuana has on your brain. It shows the relationship between marijuana and brain chemicals and how this impacts alertness, mood, the munchies and more. This program includes a former marijuana user looking back at the impact of his daily use of marijuana on school work, social life and mood.

https://www.mayoclinic.org/patient-education?VID=VID-20326113 (5:08)

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