Exo are capable of taste, smell, and other senses. In fact, their sense of smell, sight, and taste are far superior to their human counterparts. 
I do not know if they have stomachs, or if they simply disintegrate whatever they injest for enhanced chemical analysis.
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	They don't have stomachs, we'll at least Cayde doesn't anyway. He mentions this in the revamped Nexus strike
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	is that canon? that sounds pretty cool actually
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	U just wanted to say canon...
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	It's mentioned in descriptions of a few pieces of gear. They can "taste" velocity, see in a broader visual spectrum, and hear more clearly than humans. The specific details of their capabilities, and limitations, still need to be fully revealed.