Illicit drug residues in sewage spiked for holidays and special events during summer 2017 in rural Kentucky.
Nicotine in the air and clothing permeates skin and enters the bloodstream at levels equivalent to inhalation of secondhand smoke.
New research builds case for a biological link between stimulant use and HIV onset.
Scientists could be getting close to identifying some of the genes that increase the risk of alcohol dependence.
How brain chemistry makes it hard to quit.