What is the most commonly used illicit drug in the US?

• A. Cocaine
• B. Marijuana
• C. Heroin
• D. Methamphetamine

Answer: (B)

The main idea here is prevalence of use. When we say the most commonly used illicit drug, we’re looking at which substance has the highest number of people who have used it at least once in a given period, such as the past year or past month. National surveys consistently show more Americans have tried marijuana than any other illegal drug, and similar patterns hold for recent use. That broad exposure is what makes marijuana the most commonly used illicit drug in the US. Remember that “illicit” means illegal substances, so alcohol and tobacco aren’t counted in this question. Factors like accessibility, social attitudes, and evolving state laws have helped marijuana reach a wider user base, contributing to its top position in usage.