For real though, it smells nice so it's probably pretty toxic. For some reason everything that smells or tastes good but isn't food ends up being toxic as fuck. Like lead and plutonium. I've heard lead is sweet (I was smart enough not to eat the wall candy growing up), and plutonium apparently tastes like sour candy. The deck is probably shitting out super fenta-cancaids fumes that're gonna shrivel our sex bits but it doesn't matter because it smells divine.
It's probably off gassing aromatics from the molded plastics parts. Anything aromatic (in an organic chem context) is possibly carcinogenic. Past that its semi-volatile phthalates and other possible additives and light volatiles that may be off gassing especially from the unit's heat generation/dissipation.
Offgassing testing is common (think new car smell...Yeah unfortunately that's carcinogenic too, but we're testing for stuff now). I'm pretty surprised they didn't either invest in the right types of plastics that wouldn't have potentially toxic emissions...unless they did and didn't care until someone noticed and spread the word.
no it's not toxic, they have regulation for that, even valve said the the fumes aren't toxic, put they aren't going to say that people can smell it because some dumbass gonna burn their nose lol