Actors have long since stopped smoking actual cigarettes for filming, but Murphy said he had put away a ton of the (much less harmful) herbal ones now preferred by the industry.
“There were these rose cigarettes that are herbal - Steve [Knight, the creator] would joke they're one of your five a day.
“I asked the prop guys to count how many I smoked just out of interest, and they think it's something like 3,000.”
Peaky Blinders series 3 in pictures
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Prop departments have a number of tricks up their sleeves when it comes to depicting drugs, switching out alcohol for coloured water and cocaine for powdered milk, baking soda or vitamin B powder, the latter of which is often used as by dealers as a cutting agent in actual cocaine.
Look out for our interview with the creator Steven Knight later in the week.
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