Tom is a teetotaler.

He's a teetotaller.

Tom is a teetotaler and only drinks Adam's ale.

My great aunt was a staunch teetotaler.

As a teetotaler, Tom dislikes being around drunks.

You're a teetotaler, aren't you?

He's a teetotaler.

Tom used to drink a lot, but now he's a teetotaler.

Tom was previously a drunk, but now he's a teetotaler.

I choose not to drink alcohol. I am teetotal.