A process evaluation of an intervention to promote home smoking bans among low income households

Exposure to secondhand smoke occurs primarily in the home due to passage of smoke-free legislation. Creation of a total household smoking ban can reduce associated health conditions such as asthma, lung cancer, heart disease and stroke. This paper describes the results of a randomized control trial of a minimal intervention to create smoke-free homes. 2-1-1 callers were invited to participate in the trial and were randomized to an intervention (mailings and a coaching call) or a control group (no intervention). We assessed reach, dose, fidelity, and receptivity to the intervention through program records and a 3-month follow-up survey with intervention participants. For the intervention materials, materials were mailed to 244 participants (99.2%) and 227 participants (92.3%) received the coaching call intervention. 92.3% received all intervention components. Participants who had full household bans at 3 months were more likely to conduct behaviors leading to a smoke-free home (i.e., making a list of reasons, having a family talk, posting a pledge) than were those with no/partial ban. The intervention materials also were rated higher in relevance and usefulness by non-smokers than smokers. Results demonstrate that this minimal intervention had high fidelity to the delivery of components and relatively high receptivity.