The long-term use of either cannabis or cannabis-based drugs harms the brain impairing memory a new study has found. It also revealed the implications for both recreational users and people who use the drug to combat epilepsy multiple sclerosis and chronic pain. Through the legalisation in several countries of cannabis or cannabis-based drugs there is an increased number of long-term users and more potent varieties are available for recreational users. It is already known that heavy regular cannabis use increases the risk of developing mental health problems including psychosis and schizophrenia. However there is still little understanding of the potential