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The biology is interesting and all, says Carl Hart, a neuroscientist and professor of psychology at Columbia University, but it alone cant tell us what the boundaries of public health should be whether prohibition is proper in the name of the collective good

There, much is unknown

There is evidence that lung-tissue damage is possible with prolonged use

Previously, studies by Mucci et al (22;25) and Pelucchi et al (26) did not observe such associations (Figure 3a)

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Also, in 2014, the Surgeon General reported that the prevalence peaks among those aged 2644 years old 16