Smoking high-potency cannabis (marijuana) may increase psychosis by five fold. Researchers have found frequent use of this 'skunk' cannabis may structurally interfere with communication between the two brain hemispheres, impacting creativity and cognitive performance. Their findings suggest the more cannabis smoked and the higher the potency, the greater the damage will be. Research is ongoing, but with major increases in cannabis potency world-wide, there is an urgent need to recognize these risks.
PositiveTip: Do not worry about this kind of brain damage–if you don't use marijuana.