Elections this year have legalization and taxation of marijuana on the ballot in Oregon, Washington and Colorado, with other states considering it and watching closely to see if this can be a viable revenue source. It would certainly reduce the costs of policing, prosecuting and incarcerating if we handled non-violent pot smokers differently than we have. The new DSM will list marijuana as a fully addictive substance, and a recent study shows that adolescents who start heavy use of pot before the age of 18 having significantly reduced IQs by the time they are in their 30s.