A vehicle system includes: smoke sensors located at different locations within a passenger cabin of a vehicle and configured to measure amounts of cigarette smoke at the locations, respectively, within the passenger cabin of the vehicle; and a smoking module configured to, based on the measured amounts of cigarette smoke, determine that: a smoking event occurred at a first location within the passenger cabin; and the smoking event did not occur at a second location that is different than the first location within the passenger cabin of the vehicle.