I have no evidence of this, and I am not proposing it is true... more like a plot for a novel or something, but What if a nation that produces almost everythi

I have no evidence of this, and I am not proposing it is true... more like a plot for a novel or something, but What if a nation that produces almost everything purposely contaminates their products with slow poisons and heavy metals so that the enemy consumer population slowly becomes stupid and ill, and unable to compete effectively on the international stage.