(British Medical Journal) This study provides the first-year results out of a 4-year longitudinal study on ~5,000 children in England and Scotland. Kids from homes where gas stoves were used reported higher rates of coughing, bronchitis, and breathing difficulties than children at homes where electric stoves were used. The results were verified by controlling for age, social class, latitude, population density, family size, outdoor levels of smoke, and type of fuel used for heating.
Melia, R. J., Florey, C. D., Altman, D. G., & Swan, A. V. (1977). Association between gas cooking and respiratory disease in children. British medical journal, 2(6080), 149–152. https://doi.org/10.1136/bmj.2.6080.149