The lost mental abilities didn’t fully return in those who quit marijuana as adults. (Anon., 2015). Marijuana has a wide range of effects, both physical and mental. Physical effects include; breathing problems marijuana smoke irritates the lungs, these problems include daily cough and phlegm, more frequent lung illness and higher risk of lung infections. Marijuana can raise heart rates up to 3 hours after smoking, this can increase the chance of heart attacks. For women smoking marijuana can cause problems with child development during and after pregnancy. This concerns medical experts because marijuana use during pregnancy is linked to lower birth weight and increased risk of both brain and behavioural problems in