More than half of U.S. adults say they have ever used marijuana, according to the National Survey on Drug Use and Health. Twenty-four states and the District of Columbia have legalized small amounts of marijuana for both medical and recreational use according to the National Organization for the Reform of Marijuana Laws. Another 14 states have legalized the drug for medical use only. Elton John and Dr. Bob Martin weigh in on marijuana usage.

• Dr. Bob Martin answers callers’ health questions

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