While I choose not to use wd-40, i do occassional use other fish scent attractors when legal (heck, even on flies sometimes).

From what I understand, there is cod liver oil in wd-40 that is what the fish key in on. Not sure what other junk is in there though.

And while there are deffinately some pristine waters that should be kept as such, in large lakes, ocean, puget sound, columbia, etc, where commercial and recreational boating ensures a year round oil slick, a little wd-40 is not going to be an issue. I'd be more concerned about what your putting on your lawn or washing off your driveway that is running into our salmon and steelhead spawning streams.

Anyway, just trying to bring in a little perspective here...