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This is a comment on" The diverging trajectories of cannabis and tobacco policies in the United States: reasons and possible implications." Addiction. 2018 Apr; 113 (4): 595-601. This is a comment on" American exceptionalism and the failure to learn from mistakes of the past." Addiction. 2018 Apr; 113 (4): 602-603. This is a comment on" The trajectories of cannabis and tobacco policies in the United States, Uruguay, Canada and Portugal: is more cross-substance learning possible outside the United States?" Addiction. 2018 Apr; 113 (4): 603-605. Show all (5)