I'm not too sure about the pine either although it sounds as if it's being used in other parts of the world pretty regularly. At any rate, in the future make sure that your cooker is drafting well and use a small, hot fire that will make any raw wood combust. Pine will certainly give you plenty of smoke when burning but smoldering pine will lead to creosote very quickly. I too would suggest a hard wood of some kind be used but if you want to use the pine, fire management will be twice as important as it would normally be. The key will be to have a small, hot fire and your dampers wide open to allow airflow. Good luck!