It's a beautiful tree, Marilyn, and here it is in the setting sun about 2 years ago. It's grown a lot since then. The 'smoke' is the bloom, clusters, tiny tiny blooms but they remain smoky looking even as the blooms fade. It's the structure of the cluster then, not so much blooms.
Cotinus is its scientific name, I think. They come in a variety of foliage colors, some dark red but mine is dark green.
It will be difficult to trim the crowns since they are so huge and expensive since there are many and I would have to hire someone to do it. Should have thought of that some years ago. But it will help to trim the lower branches, I think.
