Allergic to Thermacell?

My dad and I were sitting in the blind the other day with the thermacell on. My tongue started tingling and going numb and my dad could quit coughing. Anyone else have it do this to you?

It says don't use in an enclosed area if I'm correct.

We had windows open. I figured that would vent it enough.

I haven't had a problem yet. It is poison though.

I set mine in the window so it can get some air movement. When I put it on the floor of the blind its a little strong. Try putting it under the the stand if nothing else.