Cat Food Addictive?

My cat don't want to eat anything else, Whiskas or other international brands, nor the boiled fish with some rice before she like so much.

Knowing the lack of controls in Thailand, it occurred to me that that brand, made in Thailand and easily found in 7 Eleven, could put some addictive substance in their cookies.

Am I just too much suspicious? But knowing what tobacco companies did with the cigarettes...

And my cat not only want that brand, but she want it every couple of hours (of course I give her 3 times a day and not so much)