Hi all: Smoked some baby backs last week for the first time in my new MES. Added wood chips (cherry) every hour. The tray was full of black unburned chips upon completion. Today I did baby backs again (cherry), with the vent open exactly as it was last week. The smoke from the original chip tray lasted 2 hours (Masterbuilt says add chips every 30 to 60 minutes)! Question: I saw it happen, but didn't think one tube of chips could last for 2 hours. Is that normal, in spite of what Masterbuilt says? If I would have waited to add wood last week, would I possibly seen the same results? P.S. The tube today had a smattering of white ash and no black chips whatsoever. I'm totally confused. Thanks for any help.