New York City has long offered walk-in, interactive exhibits to lure tourist dollars away from such staples as the Metropolitan Museum of Art, the Statue of Liberty and the Empire State Building. Exhibits have focused on everything from artifacts from the Titanic and Pompeii disasters to the Dead Sea Scrolls, the Vikings and Harry Potter. Now, add something new and kind of cool-sounding, scheduled to open October 1: an interactive exhibit inspired by … cannabis.…