Which is of greater cancer risk: Smoking or pollution?

Tobacco smoke is just one of many carcinogens floating around in our atmosphere today but yet it takes the blame for the massive increase in reported cases of cancer of all types as well as many other kinds of illness. Despite a steady decline in tobacco smoking since the 1950's cancer related illness has increased 50% or more.

Air pollution if it is bad enough and concentrated enough can cause cancer I am sure. But I know from personal experience that smoking can cause Cancer.

Smoking has decreased and cancer cases have increased. People are living longer these days despite the fact that most of the oldies would have enjoyed being smokers back in the fifties and sixties. Logic says that there has to be another factor which is causing the increase in cancer. There are known carcinogens in our atmosphere which suggests that air pollution is a much bigger factor than smoking ever was or has been blamed for.