Johnson, 72, suffers from lupus, Sjogren's, fibromyalgia and scoliosis. For the last year, she's participated in the state's medical marijuana program. But up until then, like many people in her age group, she'd never used marijuana.

According to state statistics, Johnson's age group — despite having the highest rate of prescribed drugs nationally — ranks third among regular users of medical marijuana as an age group.

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