A big gun who oversaw beheadings for Islamic State’s brutal police force got a taste of his own medicine when his severed head was found with a cigarette in his mouth.

The body of the snuffed jihadist carried the anti-smoking message: “This is evil, you Sheikh,” according to the Syrian Observatory for Human Rights, Reuters reported.

The corpse of the Egyptian – a deputy “emir” of the notorious al-Hesbah force in Syria’s Deir al-Zor province – was recovered in the city of al-Mayadeen with signs of torture, the Observatory said.

“We do not know whether Islamic State killed him or whether it was local people or other fighters,” said Rami Abdulrahman, who runs the Observatory. “Either way it is important, because he was a very important man.”

The al-Hesbah “morality police” enforce Islamic State’s edicts by ordering executions and amputations, among other punishments, a UN report said in November.

Islamic State has declared that smoking is “slow suicide” and has passed stringent Sharia laws banning its members from using tobacco, drugs and alcohol, the International Business Times reported.

“Every smoker should be aware that with every cigarette he smokes in a state of trance and vanity is disobeying God,” the terror group warned.

Al-Hesbah religious police enforce the policies in the self-styled caliphate across Iraq and Syria – including rules on women’s appearances.

Islamic State has killed residents in its conquered areas for being enemy fighters, as well as for actions such as adultery and blasphemy, which the group sees as violations of Islamic law.

Another self-declared police force in Syria beheaded four men in December for alleged blasphemy.

The Observatory reported on its Web site that al- Hesbah police in al-Mayadeen have arrested everyone wearing trousers in the streets and informed their relatives that they have to bring “loose clothes” to secure their release.

In November, a French fighter abandoned the terror organization because it was too hard for him to quit smoking, France24.com reported.

“I had brought Nicorette gum with me, but it wasn’t enough. So I left my gun with my emir and I left,” the former militant told the news outlet.