This is why I tend to believe in scents. In humans smell and taste work together. I assume bass are similar. Now I definitely could be wrong but I think fish, specificaly bass do use their sense of taste. I think they use taste more then smell but they probably do use smell a little. I have heard many anglers claim that fish hold the bait longer with scent applied. I also have experienced this. I do think that the smell of a slow moving bait will help a little but I think taste helps more. I have seen footage of a bass biting a jig and the angler had no idea he was bit the fish spit the bait and he never knew it.. After seeing this, I think fisherman using scent/attractant may believe they are getting more bites because they are aware of more bites.
I have also seen bass reject food after tasting it. So they were interested enough to try it but something was negative about the taste. Tadpoles come to mind. I have fed bass bullfrog tadpoles and they almost never kept them down and they rarely tried them again. these same bass would eat a small bullfrog but not the tadpole. And toads, forgetaboutit! I have never seen a bass eat a toad and not spit it out.
One more example. I make my own scents using the actually prey fish species. One day I was throwing a prototype trout swimbait with my secret trout sauce on it. I watched a big (around 10lbs) bass come out from under a dock from a distance and charge the bait. The fish hesitated right when it got to the bait and then it nipped the tail. It slowed for a second and then charged and swallowed the bait. I ended up loosing the fish >
I theorize that the fish was unsure about the bait. I was fishing a lake where swimbaits are heavily fished so I am sure this fish had been caught before. I think when it nipped the tail it was tasting it. When it tasted like a real trout, it ate it.
So I don't know how much bass use their sense of smell or even how much they can smell, but I believe they use their sense of taste alot. I also believe taste and smell overlap.
BTW I really like that sweet stink of power worms.