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Lindsey Tanner

Mind-altering breast milk detected in study

CHICAGO—Marijuana's main mind-altering ingredient was detected in nursing mothers' breast milk in a small study that comes amid evidence that more U.S. women are using pot during pregnancy and afterward.

Experts say the ingredient, THC, has chemical properties that could allow it to disrupt brain development and potentially cause harm, although solid evidence of that is lacking.

Rise in teen suicide, social media coincide

CHICAGO—An increase in suicide rates among U.S. teens occurred at the same time social media use surged, and a new analysis suggests there may be a link.

Suicide rates for teens rose between 2010 and 2015 after they had declined for nearly two decades, according to data from the federal Centers for Disease Control and Prevention.

Why the rates went up isn't known.