Conquest is well ventilated, I'm a non-smoker also, and only detected a hint of cig. smoke a few times. The dining rooms and lido restaraunt (thankfully) are smoke free, as is the main lounge. I don't get how people can do that to their bodies myself... But hey, to each their own.
Have fun on Conquest, if Cory is still the CD, don't miss his bird show.