Orange Vape Juice
Orange is harder to do convincingly than the other citrus fruits. Get it wrong and it tastes of squash concentrate; get it right and it is one of the rounder, less acidic citrus options.
Blood orange is the version worth seeking out - darker and slightly bitter, closer to a Seville than to a supermarket orange. Orange ice is the cold one, and orange mango is where it works as a supporting fruit rather than the lead.
Orange and chocolate is the other pairing that turns up, though it sits in the dessert range rather than here.
See also lemon, grapefruit and citrus. Like the rest of the citrus family, orange is kind to coils.