KOOL is a brand of menthol cigarette currently produced by the R. J. Reynolds Tobacco Company, introduced in 1933, that has marketed itself towards the "sophisticated man". Originally introduced as an unfiltered "regular" size cigarette, filtered 85 mm king-size versions were later added to the lineup as filtered cigarettes gained popularity in the 1960s. Since then, mild (milder menthol flavor), light (reduced tar), and 100 mm long varieties have been introduced. Nat King Cole, who died of lung cancer at the age of 45, was known to chain-smoke Kool cigarettes, which he believed to have a beneficial effect upon his singing voice.