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ISIS terrorists have been recorded savagely beating a group of their cowering fellow jihadis.

Their crime? Enjoying a sneaky cigarette.

The shocking footage shows a masked militant walking up and down the men, who are lined up sitting against a wall.

He stomps on the men, who vainly try to defend themselves from the blows raining down.

The thug also jabs the men with the barrel of his assault rifle, and at one point bashes the head of one of his victim's with the wooden butt of the weapon.

He is then shoved aside by a colleague, who frantically whips the men with what appears to be a belt.

ISIS enforce strict rules against smoking – considering the habit a "slow suicide" and, therefore, un-Islamic.

Anyone found smoking on land owned by the caliphate could be publicly whipped, massively fined or even executed.

Abu Mohammad Hussam, founder of Raqqa is Being Slaughtered Silently (RBSS), an anti-ISIS group, told the Independent: “The first time he will be arrested and flogged (40 lashes).

“If he smokes again, he will be whipped and imprisoned. On the third occasion, he will be taken to a camp in the countryside and fined a large sum of money.”

A senior IS police chief was found decapitated with a cigarette hanging from his mouth in February earlier this year.

The words “O Sheikh this is munkar” were written on his body, translated as “this is evil, you Sheikh,” according to the British-based Syrian Observatory for Human Rights.

Confusion over the appropriate punishment for smokers reportedly led to a fight that killed 12 ISIS members in February.

Middle East News quoted witnesses as saying that ISIS militants in Kirkuk, Iraq, had arrested some smokers and flogged them.

Others, who were previously warned to give up the habit, had their fingers cut off.

“Some ISIS elements did not approve the punishment of cutting fingers and considered it illegal, which led to a fight that left 12 of them dead,” the witnesses said.