He's a teetotaler.

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

Tom is a teetotaller.

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

My great aunt was a staunch teetotaler.

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

Tom isn't a teetotaler.

Tom is a teetotaler.

You're a teetotaler, aren't you?

I choose not to drink alcohol. I am teetotal.