I’m only talking about three people so I guess it’s hard to make a universal judgment on that number :-)
I grew up in an Italian-American neighborhood and there was about 20 of us and one used a lot of pot and a couple used Coke but it died out very early except for the pothead. I’d say 18 out of 20 didn’t do drugs. Maybe pot a few times. We did do a lot of drinking though in our youth
I grew up in the 70’s and 80’s in San Francisco. Drug use was common.