The recreational use of marijuana is now approved in seven states and the District of Columbia (1). The use of marijuana for medical purposes is legalized in more than 20 states (1). It is estimated that 13% of Americans currently use marijuana for recreational purposes (2). With this plethora of pot, it is inevitable that some nonusing bystanders will be unwittingly or unwillingly exposed to cannabis and related cannabinoids. In the report by Wilson and coworkers in this issue of Pediatric Research (3), the issue of secondhand exposure to marijuana smoke is described, showing another silent risk to children.

Studying the urine of children hospitalized for the treatment of bronchiolitis, Wilson and coworkers found metabolites of the psychoactive component of marijuana (3). Sadly, the ages of exposed children ranged from 1 mo to 2 y (3). The authors also found that home use of marijuana was denied by several of the parents or care providers of these exposed children in the face of biochemical data (3).

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