Download the Drug Enforcement Administration (DEA) Marijuana/Cannabis Fact Sheet to learn about the drug's history, street names, effects on the mind and body, and more.

NOT 'Just Weed': Four Times More Dangerous in Three Decades

Higher THC levels in marijuana are linked to increased problems with memory and learning, distorted perception, difficulty in thinking and problem-solving, and loss of coordination. Higher THC also exacerbates the effects associated with regular use of cannabis, including physical dependence and withdrawal following discontinuation, as well as psychological addiction or dependence.

Check out a Get Smart About Drugs graph showing how the average amount of THC in cannabis seized by the DEA has surged during the 21st century. Higher THC content is linked to a higher chance of psychosis, schizophrenia, and problems with memory and learning after using marijuana.