In the UK, smoking while driving is not illegal in itself  but there are important restrictions and conditions. You can legally smoke in your own car or van as long as you are alone or with other adults. However, smoking while driving becomes illegal in certain situations, such as when you have a passenger under the age of 18. In these cases, it is against the law to smoke in the vehicle, even if the windows are open or the sunroof is down.

The Law on Smoking in Cars with Children

Since 1 October 2015, it has been illegal to smoke in a car (or any private vehicle) with anyone under 18 present. This law applies to both drivers and passengers and is part of efforts to protect children from second hand smoke in enclosed spaces. Breaking this law can result in a fine of up to £50 for both the person smoking and the driver, if they allow it to happen.

The law applies whether the vehicle is moving or parked with the engine on. It covers cars, vans, and other enclosed private vehicles, but does not apply to convertibles with the roof fully down.

Smoking and Driving Safety

Even though smoking while driving isn’t banned outright, it can still be considered dangerous driving or driving without due care and attention if it distracts you. Lighting a cigarette, dropping hot ash, or fumbling with a lighter while driving can divert your focus from the road. If police believe your smoking contributed to a lack of control or a crash, you could face charges, penalty points, or a driving ban.

This applies to anything that distracts the driver, not just smoking. The risk comes from the action, not the substance but if smoking causes a lapse in concentration, it becomes a safety issue.

Smoking in Work Vehicles

If you’re driving a work vehicle, different rules may apply. Smoking is banned in any work vehicle used by more than one person, even if they’re not present at the time. This includes taxis, company cars shared between employees, and delivery vans. Employers are legally responsible for enforcing this rule, and vehicles should display no-smoking signs by law. If you’re unsure, check your employer’s policy or the vehicle’s registration status.

Vaping While Driving

Vaping is not covered by the smoking ban in cars with under-18s, but it’s still subject to the same driving laws. If using a vape distracts you, creates a large cloud that obscures your view, or contributes to an incident, you could be charged with careless driving. While vaping is technically legal behind the wheel, police can still intervene if they believe it affects your ability to drive safely.

Summary

You can smoke while driving in the UK, but not if you have anyone under 18 in the car. Smoking in work vehicles is also restricted under health and safety laws. Even in legal scenarios, smoking that distracts you can lead to fines or driving penalties. For safety and compliance, it’s best to avoid smoking behind the wheel altogether, especially when young passengers are involved or your attention needs to be fully on the road.