A used cigarette butt discarded on the ground is a reminder of the harmful effects of smoking. Cigarette smoking is one of the leading causes of preventable death worldwide. It increases the risk of heart disease, lung cancer, and other respiratory diseases. Not only is smoking harmful to your health, but it also pollutes the environment. Cigarette butts are the most common form of litter, and they can take years to decompose. When you see a cigarette butt discarded on the ground, remember that it's not just an eyesore - it's also harmful to your health and the environment.