As with any research that is being or has been done I know that the human sense of smell is very good. I still however would not say it is as good as a dogs or pigs. I think we humans have a very good sense of smell and can use it to find out stuff we wish to know.
The sad part of all of this is I can now only smell very strong odors. Most of my sense of smell is gone. SO with bad hearing, no sense of smell or taste and my eyes going bad I only have tough left. Come let me touch you. Does that sound bad? :D.