Tire smoke responds to wheel slip, load, speed, tire temperature, contact-patch heat and drift angle. Smoke expands, rises, mixes, curls and gradually dissolves into the atmosphere. Vehicles physically interact with the smoke, pushing it around their body and opening passages when driving through a cloud. Optional engine exhaust includes restrained diesel soot, cold condensation, head-gasket steam and oil smoke from engine damage. Optional radiator/coolant vapor and genuinely overheated brake sm