Damn. I've done whippits plenty of times and with plenty of people and I've never seen someone react badly. Also I'm pretty sure dusting means smoking PCP with your weed. Even if it means abusing those duster cans as an inhalant, that's totally different from whippits. Whippits are just nitrous oxide so they don't cause brain damage, unlike pretty much every other inhalant, most which are a hydrocarbon of some kind. As long as you don't hold them in so long that you become oxygen deprived they're pretty safe. Not that I'd recommend them, they're expensive and not that much fun anyway.