A recent study shows that habitual marijuana use reduces the amount of dopamine in the brain. This is linked to a general lack of caring, as the habitual users are experiencing a dampened-down version of reality. Low dopamine levels have been linked to depression, ADHD, anxiety, etc.
There is a perception out there that marijuana is “natural” – barely a drug. Studies like this show that habitual use of marijuana does have profound negative consequences, including to a students ability and motivation to learn.
I am a firm believer in the legalization of marijuana – I believe that organized crime is the only beneficiary of prohibition. However, legal or not, individuals should not choose to allow marijuana to become a lifestyle, as the effects of its habitual use are insidious and far-reaching.