Mass. Gen. Laws ch. 272, § 86C: Smoking in buildings used for stabling horses or mules

Section 86C. No person shall have a lighted cigarette, cigar or pipe in his possession in any building in which by the provisions of section eighty-six A two unobstructed means of exit are required or in which by the provisions of section eighty-six B the employment of a watchman is required, except in a room in said building made fire-resisting.