So true, smell can totally transport you anywhere instantaneously, it's like a leygate.
Often, as far as we know, a persons initial scent often matches their aura color (though how many people are still using there initaial scent is unknown), but I was thinking that this is still a decent jumping off point. So if we are considering Dee's original scent then we migt begin by thinking of things that are yellow, yes?
Some things that I can think of are:
sulphur, mustard, pineapple, yellow bell pepper,yellow tomato, potatoes, ginger, egg yolk, wheat, golden raisins, jasmine powder, sassafras, barley, yellow frogs, snakes, canaries, lemon, cheese, mango, papaya, leaves, sunflower, tumeric, daisies, tulips, pollen, butter, bananas, corn, peaches, old book pages, squash, dandeion, daffodils, flames, chanterelles...
There are a billion other options, and not all of these particularly have a smell, but most
of the things that I came up with are pleasant or happy, you know like bright yellow sunshine happy stuff. Maybe it's my own bias in creating the list, maybe his scent is something different all together (thouhts please), or maybe Dee's scent was initally happy.