The Berkeley City Council has introduced a bill to regulate smoking for city employees.  The bill got initial approval Monday. It will get further study at the council's March 18 meeting. The bill would prohibit smoking in all city-owned buildings and vehicles, with some exceptions. Smoking would be permitted in the: Lobby of City Hall between 6 p.m. and 8 a.m. Truck bay area in Fire House 1 and 2.  Lobby of the Police Department.  City clerk's office when it is used by the City Council.  City vehicles if the driver and the passengers agree.  Street department lunch room designated as a smoking area.  Truck bay area of the Street Department garage.  Civic Center.  The bill would prohibit smoking: When employees fuel vehicles.  In emergency vehicles while on emergency calls.  The city would be responsible for supplying no-smoking signs, notices and postings on city premises.  Employees who violate the smoking policy would get an oral warning on the first offense, written on the second and further disciplinary action for any other.