Marijuana crops are raising concerns over water and pesticides

More legal and illegal marijuana plants have sprouted up across the country. But the crop's needs are leaving their mark.

Restrictions and lack of funding have hindered research

Federal health agencies spend millions on pot science. But most money is spent on addiction research, not on the benefits.

States struggle to develop weed safety regulations

Without comprehensive regulation and established lab testing, scientists say medical marijuana patients could consume contaminated weed.

From cookies to lotion, is edible marijuana worth the risk?

Marijuana is consumed in ways unimaginable a couple decades ago. But could their ability to deliver a higher high do more damage than good?