Still new to smoking, and smoked my first chicken yesterday...sort of. After 3.5 hours, it still wasn't fully cooked. Close, but no cigar. It was going on 7:00 pm and the family was getting hungry. I pulled it off and put in the oven to finish. Had smoker up to 250 the whole time and seemed to be going well....just couldn't get it over the top. Should I have started earlier or is there something else I should have considered? I was using a WSM with the chicken on the top grate, all vents open. Thanks.