Complacency and carelessness while driving can divert the attention of the driver. Moreover, he may touch something that can lit fire too resulting the accident. In addition to it smoking also produces smoke which may become harmful for passive smokers inside the car.
Smoking while driving can be one of the leading cause of vehicular accidents and even death as it would distract the smoker making it impossible to control both hands with the steering wheel. The chief ingredient in tobacco is nicotine which is a stimulant causing C.restless movement,nervousness,shaking and compulsive movements.