CNN Weed Dr. Sanjay Gupta Reports December 1, 2014 02:25:00
Anxiety attacks in people. >> how do you know when you've done too much? >> simple tasks become very frustrating like mixing paint and then i sort of get into this state of duh, you know? >> and why that happens is what columbia university scientist carl heart is investigating. research subjects in his lab smoke marijuana and then take a variety of cognitive tests. >> the effects would be disruptions in memory. disruptions in inhibitory control. they will become slower at cognitive functioning. these effects are temporary but they're pronounced and they are clear. >> it's slowly becoming clear...