Please pardon my ignorance but this is my first time smoking meat. Do I continually add soaked chips throughout the smoking process or just leave the chips i started wit in the pan? I have noticed after about 90 minutes that the smoke eminating from the smoker has decreased significantly and when I opened her upand peaked in the chip box it seems the chips are lmost like charcoal and very little smoke it coming from them...PLEASE HELP! Oh - I have a 34' Smoke Hollow gasser. thx.