I don't understand this. The sense of smell processes the molecules released by food (or anything else with a smell). How can gravity affect it?
Gravity doesn't, not directly.
What does have an effect is air pressure. Spaceships and habitats are kept at a relatively low air pressure, which has a big impact on the senses of smell and taste. Gravity's effect on air pressure only applies, of course, when out in the open. I assume that our first Mars colony will be in appropriate protective gear when not in habitats.
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