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Second hand smoke and casual smoking (one per week) are indistinguishable.

Today, maybe. Btw, a side line to the point as do qualify your defintion, other peoples'' definition of casual and very casual vary a lot, I know people that if a pack lasts more than one day they consider that casual.

I have seen a few definitions of casual smoking, I meant (one cigarette per week). I have seen not smoking every day, averaging less than one cigarette per day used.

"Pack year" is often used as a risk assessment: https://en.wikipedia.org/wiki/Pack-year 1 pack year in a lifetime is not safe, but it is a vastly lower risk profile than a pack+ per day smoker.

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