Dr. Daniel Amen’s Brain Scans of Youth and what their brain looks like when using different drugs at different ages and for different length of times. The middle two are what a normal brain looks like. The one on the top row on right side is the brain of a 16 year old who used low potency marijuana that was common during the 80s for 2 years. Marijuana today can be anywhere from 3 to 10 times stronger than pot from 30 years ago. Protect your brain!