This article continues the theme of ISET Economist blog “Decriminalize Marijuana?” written by my colleague Saba Devdariani in June 2015, where he described the philosophical aspects related to marijuana state regulations and medical consequences of its consumption.

According to a recent study, smoking marijuana for many years leads to a severe loss of intelligence: compared with people who did not consume cannabis, the IQ’s of smokers were lower by 13-38 points (Meier et al.: “Persistent cannabis users show neuropsychological decline from childhood to midlife”, PNAS 109, 2012). Moreover, after a long time of consumption, cognitive abilities and memory do not recover when smoking marijuana is eventually given up.