We planted a smoke tree in our front yard in full sun some years ago. It has never produced the beautiful "smoke" I'm used to seeing on other smoke trees though it has grown a lot and looks healthy.
Why Won’t My Smoke Tree Bloom?
When plants don't flower as they're expected to, look to sun (which you say this plant has plenty of), or soil. Here's an article about smoke trees: https://www.gardeningknowhow.com/ornamental/trees/smoke-tree/growing-smoke-trees.htm
As the article mentions, the smoke tree likes alkaline soil, so you might want to check the pH of the area where the tree is, or have it checked A nearby extension office https://www.gardeningknowhow.com/extension-search/ can help you with that.
Also to encourage flowering, you could add some high phosphorous fertilizer, or some bone meal