Assuming we are talking about cigarettes, it is legal to smoke in your own car while driving as long as there are no children in the car with you and the smoking doesn’t impede your ability to drive safely.
You must also have an ashtray in the car as throwing lit butts out the window is littering and a bloody good way to start a fire.
Smoking while driving is legal in;
- New South Wales
- Australian Capital Territory
- South Australia
- Western Australia
- Northern Territory