No, it is strictly illegal to smoke or vape in a London black cab, or any other licensed taxi or private hire vehicle in the United Kingdom. This law has been in place since the "Health Act 2006," which banned smoking in all enclosed public places and workplaces, including work vehicles. Because a taxi is considered a workplace for the driver, the ban applies at all times—even if there are no passengers in the car or if the driver is off-duty. In 2026, Transport for London (TfL) has reiterated that this ban includes all electronic cigarettes and vaporizers. Drivers are required to display "No Smoking" signage in the passenger compartment. If a passenger is caught smoking, they can be issued an on-the-spot fine of £50, which can increase to £200 if the case goes to court. Most black cab drivers are very strict about this rule to avoid heavy fines themselves and to maintain a clean, odor-free environment for future passengers, so you should always wait until you have exited the vehicle and are in a designated outdoor area before lighting up.