On the dark side the smell of urine now reminds me of being at Alton Towers
I'm not sure how I feel about that lol. On the light side hot donuts and popcorn take me right there!
Some of the smells of Duel are deliberately produced but I think some aren't, although they are quite freakish smells! I think the incidental smells are latex and MDF wood.
Oh and the one is Hex (octagon smell) is one of my favourite smells they use. Another I just remembered is this coconut slice I was eating the other day. I've never had coconut at a themepark (I actually don't usually like it) but it seemed to taste magical - mysterious.