[RWebb]

By defn, "excess" is too much - that does not mean that thing will cause cancer.

But, as usual, sammy is way off base -- plug aliphatic petroleum distillates + cancer into Google, sammy.

The Purdue Univ. web site is one good source.

Nonetheless, WD-40 is pretty low on the harm list.

I agree it is also pretty low on the list fo thing that are worthwhile to use -- I keep a can in the garage as an "art object" - next to the old oil cans from the 1930s and the Marvel Mystery Oil can...