Whatever vices people have, that is their problem so long as it does that impact adversely on others , and also it is not something that is not needed for the operation of society
For example , motor cars , air transport do affect the planet , but in the modern society , it is not something that we can now do without .
However , passive smoking affect others who chose not to smoke , and moreover smoking is not a requirement for society to operate .
An ex colleague of mine died , from lung cancer - ( the doctors stated it was due to smoking ) - the thing is he himself did not smoke , but he worked in an inviroment where he was in contact with other smokers
I regularly pass a college each day , where there are always a large number of teenagers standing outside smoking - I always wonder if they are aware of the health risks to themselves and others .