English: Roll-your-own cigarettes (also called RYO, MYO,rollies, roll-ups, hand-rolled cigarettes, or simply rolls) refer to a cigarette made from loose tobacco and rolling papers. Roll-your-own products are sold as a pouch of tobacco for rolling hand-rolled cigarettes, sometimes with the rolling papers provided in the pouch. Loose filters can also be bought and added to the rolled cigarettes. Some people add marijuana to a hand rolled cigarette. Hand-rolled cigarettes give smokers the ability to roll cigarettes of any diameter they choose, and hence vary the strength of the cigarette. Many people use machines, from hand injectors to large machines in stores, to make cigarettes for themselves. Rolling tobacco can be additive free, although premium additive free products are available.[citation needed] Like all tobacco products, smoking causes various diseases. Cigarettes made with pipe tobacco are cheaper in the United States than factory-made cigarettes.