The main ingredient in cigarettes is tobacco. Farmers use many chemicals to grow tobacco.
After the tobacco plants are picked, they are dried and machines break up the leaves into small pieces. Artificial flavourings and other chemicals are added. Some chemicals are put in cigarettes to keep them burning; otherwise, they would go out.
There are over 4,000 chemicals in cigarettes. Many of them are known to cause cancer.
Cigarettes are made from dried tobacco leaves rubbed together to make a brown, flaky mixture. This mixture is then rolled in a cigarette paper to hold it together.
Cigarettes can be made with or without a filter. People can roll their own cigarettes, or buy ready-made cigarettes in packets.