It certainly is. When I was in Korea (1961-62) and living in the standard building there, a quonset hut, one of the guys could come back from eating kimchi, and--this is a bit of an exaggeration, but not much--you could be at the other end of the quonset hut and smell the kimchi.
For those unfamiliar with it, kimchi (at least the stuff that I came across) was made basically of cabbage, with a few other vegetables, such as red peppers, mixed in). It was usually placed underground until it fermented to a certain "flavor." The smell of it on someone's breath was breathtaking.
Oh, I forgot to note that onions were also a primary ingredient.
I had an extremely cute Korean girlfriend when I was there and she was always careful to not eat kimchi on those days when she went out with me.