Especially in the late '90's early 2000's?
Very curious to know. Wonder, too, if it has changed. We were always told to leave for 2-3 days, but it wasn't "bad" for you. The villagers and palaperos are still using something where we are in Arroyo Seco, but when I ask, no one seems to know exactly what it is.
You can pm me if you like.