Ya know, that's an interesting question. Deer definitely get used to certain scents and don't associate them with danger. The last time I hunted (which was almost 20 years ago unfortunately) my partner and I had exclusive rights to a small piece of property that bordered a gas station. The best cover scent we came up with was a little bit of gasoline. Now that I'm not 16 anymore, I don't think I'd do that again if I had the same opportunity today, but it sureworked for that place.