Respiratory issues can start in a young age such as asthma and develop into more serious respiratory issues later in life.  Research suggests that people who smoke in their early years may develop serious respiratory issues in their 40s.  

Asbestos was also a major issue  for many people who had to handle the substance.  Respiratory issues caused by asbestos did not appear until 20 years later. 

Find out further information from the Australian Lung Foundation