Drifting Tobacco Smoke Exposure among Young Adults in Multiunit Housing.

This study evaluated young adults' exposure to drifting secondhand smoke in San Francisco County housing units using the 2014 Bay Area Young Adult Health Survey (N = 1363). Logistic and geographically weighted regression models were used to determine whether residing in multiunit housing or in areas with greater neighborhood disorder were risk factors for exposure, and how drifting smoke exposure varied spatially within San Francisco County. Residing in buildings with five or more units significantly increased the odds of reporting drifting smoke exposure [OR (3.5 1.3, 9.9)], but neighborhood disorder did not have a significant association in the fully adjusted logistic regression model. At the local level, however, neighborhood disorder was significantly associated with exposure in lower income residential and downtown areas. Multiunit housing was significantly associated with exposure across all neighborhoods.