How many more years do you have to go? cheap viagra 100mg canada The researchers claim their work is important because many people have their first experience with the drug in their adolescent years and yet little has been done to understand the effects of marijuana on the teenage brain. Jutras-Aswad and Hurd say their research shows pot is not exactly “harmless” to the adolescent brain -particularly to those who are already predisposed to be vulnerable to addiction psychological conditions – but it also isn’t likely the sole root cause of addictive behaviors.