Recent research has suggested that second-hand smoke exposure is linked to hearing loss in adults.
Led by Dr David Fabry from the University of Miami, the study looked at around 3,300 non-smokers aged between 20 and 69.
The researchers assessed the degree of hearing loss in the volunteers and found that those who had been exposed to second-hand smoke demonstrated an "increased risk of hearing loss for low to mid frequencies and high frequencies.
Martin Dockrell, director of policy and research at Action on Smoking and Health (ASH), commented on the findings: "It is not a very well known effect of second-hand smoke.
"Many people have a very wide sense of the serious nature of harms caused by second-hand smoke, and that makes a difference, however the challenge is to get smokers to understand the very good evidence for the wide range of harmful effects."
According to ASH Scotland, tobacco control in Scotland has been a success, with youth smoking reducing from a peak of 30 per cent of 15-year-olds being regular smokers in 1996, to 15 per cent in 2008.