Actors could be exempt from the ban on smoking if the cigarette is crucial to their role, health officials have said.

The move – which would affect theatres, film and television work – comes after concern from producers that the new law could ruin performances of characters such as Winston Churchill, famous for his cigar smoking.

A Department of Health spokesperson suggested the issue will be resolved. She explained: "The government is considering providing a specific exemption from smoke-free legislation to ensure that smoking can take place on stage during live theatrical performances, or during film and television recording, where smoking is integral to the plot or storyline."

However, the government wants to clarify when exactly smoking is essential so the exemption will not be broad. The spokeswoman added: "We will be consulting with the theatre industry on what they consider integral to the plot."

The ban would usually apply to smoking in almost all places of work.