According to an article in the Billings Gazette entitled “Is the Big Sky blowing smoke?” only water vapor comes out of the stacks at the three oil refineries around Billings and the sugar beet factory.     Ryan Wegner, manager of finance and public affairs at Phillips 66 Billings Refinery, explains why anyone who says the Big Sky is filled with anything other than steam is just blowing smoke. “Many folks see these plumes from our facility and believe they are something other than what they actually are — steam….