If you're someone that's sniffing the vents of your Steam Deck then I need say a couple of things: First off, what the hell is wrong with you? Secondly, Valve says you should probably not do that.
Apparently there's some joke or meme about sniffing the exhaust vents of your Steam Deck. Huh?... What? I don't know what this is all about. Maybe it's some dumb zoomer thing like eating Tide Pods, licking Switch...