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It is important to consider alongside the potential harms to cannabis users, the mental health and psychological harms illegal drug use can bring to others. Crime, family adversities, economic cost and decline in community social cohesion can all impact the mental well-being of others as well as the users. 
For example, over a third of police forces in the UK reference the supply of cannabis by county line groups. With this comes high levels of violence, including the prevalent use of weapons and firearms to intimidate and control members of the group and associated victims. 
 Nutt, D, et al. 2010. Drug harms in the UK: a multi-criteria decision analysis http://www.thelancet.