Are e-cigarettes the ultimate tobacco cessation tool or merely a fruity-flavored gateway to a new generation of addiction, illness, and health care costs? The front lines of that debate could be in Oklahoma. According to one vapor store owner: “You can’t even get commercial retail space in Tulsa right now in that 1,200- or 1,500-foot range because everyone is opening a vapor store — it’s crazy.” Crazy good or crazy bad? The NYT’s Matt Richtel takes you to the place where vapor comes sweeping down the plain.