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 ...
Selecting where to plant your dogwood: Choose a site for your dogwoods that is well-drained but does not get extremely dry. Soil high in organic matter is best. Dogwoods can be planted in full sun or partial shade, though partial shade is best (morning sun in particular). Dogwoods are typically an understory tree in the wild. Dogwoods are easy care trees that will likely bloom by their second year, but sometimes will bloom in their first year. Planting your dogwood: Before you plant, cut off any damaged roots with a sharp knife, and soak plant roots in water for 3-4 hours.