This is the most important reason to buy a dedicated cigarette bin. Regular trash cans often contain paper, napkins, or other flammable materials. If a still-lit cigarette butt is tossed inside, it can smolder and start a fire. Dedicated cigarette ashtray bins are designed with fire-safe features: they usually have a metal interior or a snuffing plate that extinguishes the cigarette, and they are made of non-combustible materials like metal or heavy-duty plastic.