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Conclusion
Over the past decade, U.S. policies have increasingly shifted toward a deregulation of marijuana for medical and recreational use. Recent legislation in several states i.e., Colorado, Washington, Oregon, Alaska) and Washington, D.C., has legalized recreational marijuana use for individuals 21 and older. More states (e.g., California) are likely to follow suit in future elections. Given this shift in the political climate and the potential increase in marijuana use among youth, it is critical to empirically evaluate the long-term physical and mental health consequences of marijuana use. Overall, data from this sample provide little to no evidence to suggest that patterns of marijuana use from adolescence to young adulthood, for the Black and White young men in the present study, were negatively related to the indicators of physical or mental health studied here. This does not discredit the work of others. It could be the case that cumulative tetrahydrocannabinol exposure, age of initiation of use, or use at one particular age is more predictive of negative health outcomes than the overall pattern of use between adolescence and adulthood. In conclusion, the health outcomes associated with marijuana use are just one piece of the legalization puzzle. Political debates surrounding the legalization of this drug also need to consider the potential effects on many other domains such as cognitive and intellectual functioning, alterations in brain function and structure, academic and occupational failure, psychosocial adjustment, antisocial and criminal behavior, motor vehicle accidents, and suicidal ideation. Many of these outcomes have been discussed elsewhere (see Meier et al., 2012; Volkow et al., 2014) and were beyond the scope of the present study, which focused only on health outcomes. Indeed, marijuana policymakers and stakeholders need to consider the results of any single study in the context of the larger body of work on the potential adverse consequences of early onset chronic marijuana use

Det er så svært at holde rede i alle de studier omkring cannabis. Den ene måned kommer der studie, som siger det ene og næste måned, siger de det modsatte.