User blog comment:Miskos3/Fairy Tail Chapter 472: Laxus vs. Wahl, Review/@comment-73.159.63.160-20160208175000/@comment-1776824-20160208183033

You don't just "become" a Devil Slayer. You're taking things too literally. Wahl was saying any normal human would have died of organ failure after ingesting that many particles. And by the way, Magical Barrier Particles aren't a curse. They're poison. They existed long before Tempester used them. Laxus sucked in copious amounts of poison and should be dead, but is clearly hanging on through sheer willpower alone.