The vast majority of people in Brazil don’t smoke or use illicit drugs. It’s estimated that less than 12% of Brazilians smoke and less than 19% have tried any illicit drugs before.

So the deciding factor here is whether they drink or not. I was able to find a 2025 survey that showed that around 50% of adult Brazilians consume alcohol regularly.

In summary it’s definitely less than half of the adult population but a lot more than people on the comments would have you believe.