Thanks Lipps.
Read those links.
Not impressed.

When you say;

"I learned years ago that companies will do anything to sell a product and my health doesn't figure into the equation."

I could not agree more.

But this;

"Your plants are going to absorb what the sheets are putting off that kill the bugs."

Is incorrect.
The sheets do not "kill the bugs".
That is not their purpose.
They are not poisonous, and despite the "scare ya" articles they are not even toxic.

They contain a voilatile compound that bollixes the scent receptors of fungus gnats.
When the gnat's try to sniff out some tasty fungus for their offspring, they get lost.
They can not find your plant.
Same with mosquitoes and yellowjackets.
They can't find you.
It is not the scent, that does it, I use unscented and they work quite well.

And while it is true that heating the sheet in the dryer to several hundred degrees, drives off traces of the chemicals used in their manufacture.
Laying them on top of the soil at room temperature does not.

And all of those links fail to mention one very important variable, the concentration of the detected compounds.
They were extremely low.
Undetectable without equipment that is able to sense parts per billion.

Choosing between a few parts per billion of an airborne, volatile, low toxicity, surfactant, while growing healthy plants.
Or letting them get infected, then dosing them with highly toxic pesticides directly on, and in, the buds, in parts per thousand, is a no-brainer for me.

So, if the sheets bother you personally, avoid them.
Most people have no problem.

If you find a better way to prevent FG & RA infestations I'm listening.
'til then, I just bought another box of sheets and I'm off to grow some bud, bud.

Aloha,
Weezard