Motivating parents of kids with asthma to quit smoking: the effect of the teachable moment and increasing intervention intensity using a longitudinal randomized trial design

AIMS: We tested two aims: (1) the teachable moment (TM): whether second-hand smoke exposure (SHSe) feedback motivates cessation in parents of children with asthma versus parents of healthy children (HC); and (2) whether greater intervention intensity [enhanced-precaution adoption model (PAM)] produces greater cessation than a previously tested intervention (PAM).

DESIGN AND INTERVENTIONS: Aim 1: two home visits (asthma education or child wellness), and cessation induction using motivational interviewing and SHSe feedback. Aim 2: post-home-visits, parents with asthmatic children were randomized to PAM (n = 171; six asthma education calls) or enhanced-PAM (n = 170; six asthma education/smoking cessation calls + repeat SHSe feedback).

SETTING: Rhode Island, USA.

PARTICIPANTS: Parents of asthmatic (n = 341) or healthy (n = 219) children who did not have to want to quit smoking to enroll.

MEASUREMENTS: Measurements were given at baseline, 2, 4, 6 and 12 months. Abstinence was bioverified. Outcomes were 7-day and 30-day point prevalence abstinence (ppa) and SHSe (primary) and asthma morbidity (secondary).

FINDINGS: Aim 1: the TM was supported: parents of asthmatic children were more than twice as likely to achieve 30-day [odds ratio (OR) = 2.60, 95% confidence interval (CI) = 1.22-5.54] and 7-day ppa (OR = 2.26, 95% CI = 1.13-4.51) at 2 months (primary end-point) and have non-detectable levels of SHSe than HCs. Greater treatment intensity yielded stronger TM effects (OR = 3.60; 95% CI = 1.72-7.55). Aim 2: enhanced-PAM was more likely to achieve 30-day ppa at the primary end-point, 4 months (OR = 2.12, 95% CI 1.09-4.12) and improved asthma outcomes versus PAM.

CONCLUSIONS: Smoking cessation intervention (Motivational Interviewing plus biomarker feedback) appear to motivate smoking cessation more strongly among parents of asthmatic children than among parents of healthy children. Increased intervention intensity yields greater smoking cessation among parents of asthmatic children and better asthma outcomes.