Gangrene ad giving my kid nightmares!

So this anti-smoking ad, which originally aired in Australia from what I can gather, is probably giving my son nightmares as we speak. It's been airing a lot in New York lately, and opened up a lovely discussion tonight with my 9-year-old son on the perils of gangrene. The good news is, based on this and other strong evidence, he swears he'll never smoke. The bad news is school starts tomorrow and I'm afraid he's still trying to figure out why gangrene makes your toes turn black. Sweet dreams.