>By late adolescence, 78.2% of US adolescents had consumed alcohol

I guess I fall into that group, since I had a few sips, given to my by my parents.

> 47.1% had reached regular drinking levels defined by at least 12 drinks within a given year

So less than half.

> drug use by 42.5%

Also less than half. I wonder how many tried it just once.

> drug abuse by 16.4%