The time it takes to recover from a cannabis dependence varies from person to person depending on factors such as the severity of the dependence, how long the person has been using cannabis and whether they have any pre-existing mental health conditions. Usually, cannabinoid receptors in the brain will have returned to normal after around thirty days of abstinence. However, the psychological effects can last much longer. This is why aftercare is so important as it provides the chance to continue working on recovery and preventing relapse in the long term.