From the 1st of October 2015 it is illegal to smoke in a car (or other vehicle) with anyone under 18. The law aims to protect children and young people from the dangers of secondhand smoke.
The law applies to every driver in England and Wales, including those aged 17 and those with a provisional driving licence.
The law does not apply to using e-cigarettes (vaping).
For more details please go to: https://www.gov.uk/government/news/smoking-in-vehicles