Today, alcohol laws are controlled by the state government, and local jurisdictions are prohibited from going beyond those state laws. Missouri has no statewide open container law or prohibition on drinking in public, no alcohol-related blue laws, no local option, no precise locations for selling liquor by the package (allowing even drug stores and gas stations to sell any kind of liquor), and no differentiation of laws based on alcohol percentage. State law protects persons from arrest or criminal penalty for public intoxication. Missouri law expressly prohibits any jurisdiction from going dry. Missouri law also expressly allows parents and guardians to serve alcohol to their children. The Power & Light District in Kansas City is one of the few places in the United States where a state law explicitly allows persons over 21 to possess and consume open containers of alcohol in the street (as long as the beverage is in a plastic cup). As for tobacco (as of July 2016), Missouri has the lowest cigarette excise taxes in the United States, at 17 cents per pack, and the state electorate voted in 2002, 2006, 2012, and twice in 2016 to keep it that way. In 2007, "Forbes" named Missouri's largest metropolitan area, St. Louis, America's "best city for smokers". According to the Centers for Disease Control and Prevention, in 2008 Missouri had the fourth highest percentage of adult smokers among U.S states, at 24.5%. Although Missouri's minimum age for purchase and distribution of tobacco products is 18, tobacco products can be distributed to persons under 18 by family members on private property. No statewide smoking ban ever has been seriously entertained before the Missouri General Assembly, and in October 2008, a statewide survey by the Missouri Department of Health and Senior Services found that only 27.5% of Missourians support a statewide ban on smoking in all bars and restaurants. Missouri state law permits restaurants seating less than 50 people, bars, bowling alleys, and billiard parlors to decide their own smoking policies, without limitation. In 2014, a Republican-lead legislature and Democratic governor Jay Nixon enacted a series of laws to partially decriminalize possession of cannabis by making first time possession of up to 10 grams no longer punishable with jail time and legalizing CBD oil. In November 2018, 66% of voters approved a constitutional amendment that established a right to medical marijuana and a system for licensing, regulating, and taxing medical marijuana. Missouri has 114 counties and one independent city, St. Louis, which is Missouri's most densely populated—5,140 people per square mile. The largest counties by population are St. Louis (996,726), Jackson (698,895), and St. Charles (395,504).