I won't ever go to the trouble of actually "adding" scent to a lure. I'll buy tubes, etc. that are impregnated with garlic/salt on occasion... may not help, but it can't hurt. But for me it's not worth the effort to actually add spray or dip scent while I'm fishing. HOWEVER, I am very picky about avoiding potentially hazardous odors. If any of my clients ever apply sunscreen, I specifically TELL them to wash their hands good before they handle my rods, baits, etc. I am very careful pumping gas before going fishing, etc. I strongly believe that foreign odors can repel fish... I saw dramatic evidence years ago on a bluegill fishing trip... a woman was catching fish one right after another, until she applied sunscreen. Her partner continued catching fish like crazy and she simply couldn't catch one.... until 30 minutes later we convinced her to wash her hands good and then she slowly started catching fish again. We were fishing live crickets and I am certain the sunscreen odor on her hands, transferred to crickets, repelled fish.