In fact, those who are pregnant and using cannabis may actually distrust the content of warning signs altogether. "Mandatory ...

A lit cigarette burns on a package of cigarettes revealing the mandatory warning labels, in the 1960s.Bettmann Archive/Getty Images In Jan., the now-former U.S. Surgeon General Vivek Murthy called ...

A lit cigarette burns on a package of cigarettes revealing the mandatory warning labels, in the 1960s. Credit - Bettmann Archive/Getty Images Vocal opponents of the tobacco industry, such as Sens.