Pursuant to M.G.L. c. 270, § 22, smoking is prohibited in the state house or in a public building or in a vehicle or vessel, owned, leased, or otherwise operated by the Commonwealth of Massachusetts or in a political subdivision thereof, or in a space occupied by a state agency or department of the Commonwealth which is located in another building, including a private office in a building or space mentioned in this sentence.
103 CMR, § 974.12