Splenda is based on Sucralose but has tons of other stuff that could hurt your atomizer. Agave will definitely kill your atty.
There's no research on xylitol, but it seems possible. Might be good for your teeth too.
Yes, xylitol is very beneficial with lots of uses health wise, but after asking my question I recalled that xylitol doesn't hold up to high heat. Don't think it can be baked with even. So, that leaves xylitol out.