THC

The main psychoactive component of marijuana protects aging mice against cognitive declines. Could it someday do the same for humans?

• By Kate Wheeling

Cannabis use can cause a signal miscommunication in the brain, which is similar to what might happen in mental illness.

• By Natalie Zarrelli

A new study finds that most medical marijuana products are inaccurately labeled.

• By Francie Diep

A reporter returns to his hometown and confronts the new reality of legalized marijuana.

• By Marshall Allen