(Willie B. Thomas/DigitalVision/Getty Images) A long-term study of more than 11,000 children and teens has linked ...

Researchers observed slower gains in cognitive tests that measured memory, focus and thinking speed among middle and high ...

A study of more than 11,000 teens finds cannabis use tied to slower gains in memory, focus and thinking speed as well as ...

Sara Ruiz/ / Getty Images/iStockphoto Teens who start using cannabis before age 15 are more likely to use the drug often later in their lives. They are also more likely to develop mental and physical ...

Teenagers who started using weed had slower gains in thinking and memory skills as they grew, researchers report today in the ...

The largest U.S. study on adolescent brain development has found that teens who start using cannabis show slower gains in memory, attention, language, and processing speed compared to non-users.

For decades, my colleagues and I advanced the premise that early substance use—nicotine, alcohol, or cannabis (or other addicting drugs)—interferes with critical maturation stages, particularly ...