I only remember taste/smell happening once.

I read once in a book that you never eat anything in a dream. Shortly later I had a dream where I was eating my mother's homemade pumpkin molasses muffins, and they tasted very good...and had texture in my mouth, and the satisfying solidness as I swallowed. In general, what distinguishes my dreams from reality is how the locations are similar-yet-different to real life. If I notice that "wait, this bus stop looks too similar to the one outside my rez to be a different place, but it's not the same" then sometimes I can realize I'm in a dream. Also, my schedule gets mixed up; in a dream, I might be going to choir practice directly from class, even though I know I don't have classes on Thursdays. All my senses are involved in dreams though, and usually fairly elaborate plots, like trying to get to class on time when things keep going wrong (buses not showing up, people coming to distract me) and I'm worried about something else.