I am a 70 y old non-smoker,did not pass my call-up health examination weak chest! I have no lung problems whatever [even I have a wife who smokes] I grew up in an age when everyone appeared to smoke,grand parents,parents,friends and when you got on the top deck of buses a thick fog of smoke enveloped you,what I am trying to get at is how is it that some people get emphysema or lung cancer is it the make-up of your genes or what?
What about the explosion of asthma is it because of diesel fumes, think about it children are pushed around in prams at exhaust height diesel and green petrol give off so many carcinogenics.