Watch Chief Medical Correspondent Dr. Sanjay Gupta’s CNN Special Report “Weed 4: Pot vs. Pills” on Sunday, April 29, at 8 p.m. ET. (CNN)An 86-year-old man in a bright yellow sweatshirt and matching baseball cap grips his walker tightly. He stands near the door of a large bus, the charter name American stretching over his shoulder. He greets neighbors and trades jokes with an official-looking woman, clipboard at the ready, checking people in as they board. They spot an older woman in black running toward them, her purse bouncing behind her. “Chin,” the woman gives her last name when she stops, a little out of breath. Come aboard the cannabus: More seniors taking trips to get weed

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