A hero FDNY firefighter was arrested for attacking a fellow smoke-eater with a chair in a Staten Island fire station, police said Wednesday.

Firefighter Christopher Mullin, 53, was busted Monday for the Friday night firefighter-on-firefighter attack in Rescue 5 headquarters on Clove Road near Targee St. in Concord, cops said.

During an argument with the 62-year-old firefighter, Mullin allegedly pulled the other man’s chair out from under him, causing him to fall to the floor and “hit his left arm and head to the ground,” according to court documents.

Mullin repeatedly punched the older firefighter as he lay on the ground and then “picked up a chair and struck [him] once about the body with said chair,” the documents said.

By the time the fight was broken up, the older firefighter had

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