I always thought dilution was the next best thing to subbing regardless of how much you smoke. If there are no head shops near you to buy sub, there may not be time to mail-order it, and you would have to try dilution. I have a friend who I would consider a heavy smoker, and he has always passed tests using dilution. I guided him through his first dilution. So I guess the main question may be, is there a good head shop in Omaha, or Lincoln, or whatever the nearest largish town is. That probably has more influence on your decision than any other factor.