Nicotine vapes are smokin' hot right now. While many people are familiar with the compact Juul device, serious vapers are all about the colossus of cloud. For those ready to master vape tricks and become a walking fog machine, Denver Vapor hits the spot. Staffers are experts on matching the right vape and nicotine level, and can describe the delights of a huge selection of e-liquid flavors, everything from guava cheesecake to a combo of apple, doughnut and milk. The hours are expansive, the products not that expensive. Puff, puff, pass.