To investigate whether parents of asthmatic children would stop smoking or alter their smoking habits to protect their children from environmental tobacco smoke.
Irvine, L., Crombie, I. K., Clark, R. A., Slane, P. W., Feyerabend, C., Goodman, K. E., & Cater, J. I. (1999). Advising parents of asthmatic children on passive smoking: randomised controlled trial. British Medical Journal, 318(7196), 1456-9. https://doi.org/10.1136/bmj.318.7196.1456