Brits drinking tea is one of the clearest examples of food consumption by one group being toxic for another group (see https://en.wikipedia.org/wiki/First_Opium

Brits drinking tea is one of the clearest examples of food consumption by one group being toxic for another group (see https://en.wikipedia.org/wiki/First_Opium_War https://en.wikipedia.org/wiki/First_Opium_War).