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Leigh Blizzard, PhD, Anne-Louise Ponsonby, PhD, Terence Dwyer, MD, Alison Venn, PhD and Jennifer A. Cochrane, BA

The authors are with the Menzies Centre for Population Health Research, University of Tasmania, Hobart. Anne-Louise Ponsonby is also with the National Centre for Epidemiology and Public Health, Australian National University, Canberra, Australian Capital Territory.

Correspondence: Requests for reprints should be sent to Leigh Blizzard, PhD, Menzies Centre for Population Health Research, University of Tasmania, Private Bag 23, Hobart 7001, Australia (e-mail: leigh.blizzard{at}utas.edu.au).

Objectives. We sought to quantify the effect of good smoking hygiene on infant risk of respiratory tract infection in the first 12 months of life.

Methods. A cohort of 4486 infants in Tasmania, Australia, was followed from birth to 12 months of age for hospitalization with respiratory infection. Case ascertainment was 98.2%.

Results. Relative to the infants of mothers who smoked postpartum but never in the same room with their infants, risk of hospitalization was 56% (95% confidence interval [CI] = 13%, 119%) higher if the mother smoked in the same room with the infant, 73% (95% CI = 18%, 157%) higher if the mother smoked when holding the infant, and 95% (95% CI = 28%, 298%) higher if the mother smoked while feeding the infant.

Conclusions. Parents who smoke should not smoke with their infants present in the same room.

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