From cheesy taglines insisting “This ain't your grandfather's marijuana” to hyperbolic headlines warning that “Cannabis Users Risk their Sanity,” we have been lectured for decades about the harms of marijuana use. There is no doubt that inhaling combustible smoke of any kind, including cannabis smoke, has adverse health effects. But what War on Drugs advertising campaigns have not told us is that while smoking may be bad for our health, being jailed — even for one night — could be worse.