JEFFERSON CITY, Mo. (AP) — A group of Missouri gas station and convenience store owners is backing taxing cigarettes an additional 23 cents per pack. The Missouri Petroleum Marketers and Convenience Store Association announced it is filing two similar initiative petitions for the tax increase. The initiative petitions would change state law to hike the current cigarette tax from 17 cents to 40 cents per pack. The petitions also call for a 50 percent tax increase on other tobacco products.