Apart from growing up on "filled ground" (ever dig a hole and find the roof of a Model T?), our first playground away from the back yard was an old dump (as I mentioned before). One neat thing was to find old batches of discarded medicines and mix them up -- "playing chemistry."

No, we CERTAINLY did NOT drink or take them!!!

Environmental factors? Probably -- six neighbors who lived within 100 yards have died of lung cancer (and so has my mother). But as Amos said, there are too many other variables.