Disinsection--I'm doused with toxic chemicals

I didn't know I needed it, but I got it. Sprayed with toxic chemicals on my way home to Switzerland from Vietnam last month. You may ask...why? Did they inspect me and find evil cooties? No. Did I have products that made me suspect? No. Air France just sprayed me and all the passengers and crew flying Vietnam to Paris. The first sign of what was coming came just after the cabin doors