Flavored tobacco products — tobacco products with added flavorings — include types of cigarettes, cigarillos and cigars, hookahs and hookah tobacco, various types of smokeless tobacco, and more recently electronic cigarettes. Flavored tobacco products are especially popular with youth and have therefore become targets of regulation in several countries. According to a 2013 survey of internet tobacco retailers, the most common flavors are apple, cherry, chocolate, honey, grape, menthol, mint, peach, rum, strawberry, "sweet" (including bubble gum, candy, mango, blueberry, strawberry, orange, gum mint, and toffee) and vanilla. Flavored cigarettes Cigarettes may be flavored to mask the taste or odor of the tobacco smoke, enhance the tobacco flavor, or decrease the social stigma associated with smoking. Flavors are generally added to the tobacco or rolling paper, although some cigarette brands have unconventional flavor delivery mechanisms such as inserting flavored pellets or rods into the cigarette filter. Cigarette flavors include anise, clove, cinnamon, spearmint, wintergreen, citrus, fruit, and alcohol (especially rum and cocktails). Flavors may be added to the tobacco, cigarette paper, filter, or even to the foil wrapper. Some tobacco companies have developed unconventional flavor delivery systems, including polymer pellet technology, using a flavored filter pellet (polyethylene bead), flavor micro-encapsulation in the paper or packaging technology, flavor fibers inserted into the filter, and flavored tips. Flavorings are typically added at the end of the cigarette manufacturing process. Flavored cigarettes are heavily preferred by youth, with a 2008 study finding that adolescents and young adults ages 17–25 use flavored cigarettes at about twice the rate of adults age 25 and older, with 17- to 18-year-olds being the heaviest users of flavored cigarettes, using them three times as much as adults. Beedi One common type of flavored cigarettes are beedis, a small, thin, hand-rolled cigarette originally from India, where they outsell regular cigarettes by a ratio of eight to one. Another is kretek, a cigarette made with a blend of tobacco and cloves that is popular in Indonesia. No flavored cigarettes, including menthol, beedis, and kreteks, are safe. Indeed, many flavorings produce increased levels of acetaldehyde when combusted, enhancing dependence and toxicity. Additionally, some of the flavorings in cigarettes contain toxic compounds such as alkenylbenzenes. Menthol cigarettes The most popular cigarette flavor by far is menthol, which represents 10% of the global cigarette market and makes up more than 25% of the market in countries including the United States, Singapore, the Philippines,