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 ...
The odor of vetiver oil is described as deep, sweet, woody, smoky and earthy. Like sandalwood essential oils, the odor of vetiver develops and improves with aging. The smell can vary significantly depending on where the grass is grown and the climate and soil conditions. Vetiver, is a green, slightly sharp note with hints of earthiness to it, reminding me of a grassy field on a dry, warm day.