I don’t remember them carding in the 70’s. Yes, there were vending machines...but it was just as easy to go to the corner store and say your parent sent you to get a pack of x brand. No questions. And they were pocket change. I don’t recall how much they were before college, but in Ky in 1981, they were.50 a pack, $4.50.So carding probably didn't work well (they had vending machines back then, I assume.) but it still doesn't work 100%.