Marijuana is the most common illicit drug used by pregnant women in the U.S., with nearly 4.6 percent reporting recent use during their first trimester and 1.4 percent in the third trimester. A number of studies have evaluated the impacts of marijuana exposure on the developing fetus. However, few have looked at postnatal exposures to marijuana through breastfeeding, and much less is known about the effects of pediatric exposures to sidestream smoke....