Starting Sept. 1, smoking will be prohibited in all Somerville’s public housing units. The decision, which applies to all of the city’s 1,358 public housing units, will be formalized in an upcoming vote of the city’s Housing Authority Board of Commissioners. The authority’s resident services staff will meet with tenants in the coming months to discuss implementation of the new policy and to advise those who smoke about some of the resources available to help them quit. The authority noted that, according to the surgeon general, the effects of secondhand smoke can include acute respiratory infections, ear problems, asthma, heart attacks, and certain cancers. A 2013 survey conducted by the Somerville Housing Authority found that a majority of its tenants responding favored a smoke-free policy.John Laidler can be reached at email@example.com.