Section 172(5) in The West Bengal Motor Vehicles Rules, 1989
(5)A passenger or the driver or the conductor or helper in a Stage Carriage or a Special Stage Carriage including a minibus or in a Contract Carriage bus excluding a motor cab or a tourist taxi or a tourist vehicle or an auto-rickshaw shall not smoke inside the motor vehicle, whether the motor vehicle is at rest or in motion in a public place.
