In France, about 12 million smokers throw away cigarette butts every day, creating a growing environmental problem. These butts are made from cellulose acetate, a type of plastic that takes many years to break down in the environment. As they decompose, they release harmful substances, such as nicotine, heavy metals, and other chemicals from burning tobacco. A single cigarette butt can pollute several liters of water, and when multiplied by the millions discarded daily, the impact on water sources and ecosystems becomes severe. Cigarette butts, though small, are a major source of pollution that affects soil, water quality, and wildlife. They often end up in gutters, rivers, and eventually on distant beaches, where they can harm marine life and degrade natural landscapes. Because they are so common and often ignored, they are sometimes overlooked as a serious environmental issue, despite their widespread presence in urban and coastal areas. In response to this growing concern, some cities in France have started to take action. They are installing more visible public ashtrays and testing new methods to collect and recycle cigarette butts. These efforts aim to repurpose the waste into materials used for insulation or construction. However, individual behavior also plays a key role in reducing the problem. To help minimize the environmental impact of cigarette butts, smokers are encouraged to use pocket ashtrays or designated bins instead of throwing them on the ground. These small changes can make a significant difference in protecting the environment and reducing the long-term damage caused by discarded cigarette waste.