Betel nut = Thailand.
I lived in China where chewing on betel nut was common. Often, the sidewalks were stained red from people who chewed on betel nuts and spat their red saliva onto the ground. One of the things that I quickly learned through an aggressive encounter with a cabbie, was that the betel nut vendors would often mix the betel nut with other ingredients including amphetamines and psychedelics.
My older hootch maids in Vietnam all chewed Betal nut.
When we lived in Bangkok in the early 1960s, we had betel nut trees beside our house. One of our pet gibbons learned how to unclip her harness. She would always go up in one betel nut trees and gorge herself. She would throw the seed pods at anyone within range. She slept in my bedroom at night, but during the day it was target practice.