" I have always been told that meat will take all the smoke it will get in 4 hours. "
So Cold Smoking Bacon for 10 to 20 hours is a total waste? Smoking Country Hams for 3 Days accomplishes nothing?
What you have been told is a common misconception and is based on confusion between " Taking " Smoke and " Absorbing " Smoke. You undoubtedly have been told that you are looking for a Good Smoke Ring in the meat. This happens because of a chemical reaction taking place between the moisture in the meat and the Nitrogen in wood/charcoal generated smoke. Since the surface of the meat will stay moist for about 2-4 hours during a smoke at 225*F, longer if using a Water Pan or Spritzing/ Mopping the Smoke will be absorbed and the Ring will form during this time and will stop after the meat surface is fully cooked and dries out, forming a Bark.
[color= rgb(24, 24, 24)]Smoke is made up of a variety of Gases and Flavorful Particles. When smoke is being generated these Particles stick to the meat flavoring the surface based on type of wood used. As long as smoke is being generated these Particles will continue to settle on the surface of the meat and increase the flavor. So essentially, as long as you generate smoke the meat will Take Smoke...[/color]
[color= rgb(24, 24, 24)]Great bark is a combination of Heat, Time, Low Humidity, Sugar and the Maillard Reaction (Browning of Proteins). Moisture during the first few hours allows for good Smoke penetration but you need it dry in there for the Bark to get going. A healthy dose of a Rub containing sugar enhances the effect. If you go into Foil before a really good bark forms, your bark will be thin. Additionally the steaming that takes place in the foil softens any bark that did form. You want really heavy bark don't foil or delay foiling to the very end...Good Luck with those Competitions...JJ[/color]