Marlboro is the biggest selling brand of cigarettes in the world. It is manufactured by Philip Morris USA in the United States and internationally by Philip Morris International. It was launched by Philip Morris in 1924 under the slogan "Mild As May." because, originally, it was marketed as a females cigarette. This changed in the 1950's when cigarettes were found to cause lung cancer. Since males were a majority of cigarette smokers, and filtered cigarettes were thought to be safer, they redirected the marketing to men though now they are neutral on gender.