This is shown by statistics from the National Board of Health and Welfare, where the most current figures are from 2015. At that time, less than five percent of mothers and around ten percent of fathers smoked when the child was 0-4 weeks old. A slightly larger proportion of mothers smoked when the child was 8 months old, while fathers' smoking was still around ten percent.

Young children exposed to secondhand smoke have more respiratory infections and ear infections, and require more hospitalisation than children not exposed to tobacco smoke. The risk of sudden infant death syndrome (SIDS) is also increased if the parents smoke.

The proportion of infants exposed to smoking in the home varies greatly between counties. Södermanland is the county with the highest proportion of children with smokers in the child's home environment during infancy – 17 percent among children who were eight months old. Skåne and Blekinge come in second and third place respectively in this statistic.

The lowest proportion of infants exposed to smoking in the home at the age of eight months is found in Västerbotten, Kalmar and Stockholm counties, where the corresponding proportions are between 4 and 8 percent.

Download material from the Swedish National Board of Health and Welfare website.