Diabetes affects our blood vessels and nerves and therefore can affect any part of the body. However, certain parts of our body are affected more than other parts.
I don't think dogwoods have (much?) scent, maybe just lightly floral. The white petally looking things are not actually petals they are bracts, like a poinsettia has. There's something called an English dogwood that is very fragrant, but it isn't a true dogwood and is also known as mock orange. Bradford pears have a smell that this author described as sweaty socks, so if your tree doesn't smell very good that's probably it: http://www.gardenguides.com/106133-dogw ...
Kousa dogwood. Cornus kousa. A native of Korea and Japan, Kousa dogwood makes an excellent landscape tree and offers a long season of interest. Beginning in early summer, white bracts in sets of four (sometimes with pink tinges) surround tiny green flowers. These are followed by reddish fruit that resembles raspberries and attracts birds.