yeah i burn wood on mine few things i have learned to get good smoke
#1 air flow- i always smoke with the firebox door wide open never close it, only do i close it if it gets real windy and even then its only partially closed. a good clean fire needs lots of oxygen
never restrict airflow that will give you dirty smoke if the temp gets too hot i open the smoke chamber door and lower the temp that way then cut off air to the fire
#2 wood- good wood i know its a no brainier but well seasoned wood is a must. plus the size of the wood you're using is critical if your wood chunks are too big they will just smoulder and that will release nasty stuff like creosote and carbon into the cook chamber which impart a bitter acrid taste to the meat. green wood burns at lower temps resulting in more black sooty smoke so well seasoned wood is a must i always try to stack the wood in the chamber like a log cabin so you get loads of airflow into the burning wood
#3 Fire- you want a good fire flames are good thing, and so is a glowing red coal bed . if you have good airflow and good wood then stack it properly on top of a nice good hot coal bed the wood will light easy and burn well burning off a lot of the nasty compounds in the wood that give a bitter taste
#4 babysit you gotta watch the fire always! i fire up the smoker every weekend so basically i have a a big stack of well seasoned oak cut up to what i want beside the firebox, my comfy lawn chair and i sit beside the firebox all afternoon. with my shovel, leather gloves and very long tongs, every 15 min or so im putting wood on poking the fire turning wood rearranging it to burn good and to maintain temp . also im always watching the smokestack to gauge the colour of the smoke, ideally i just wanna see very very light smoke coming out almost invisible or with a slight blueish tinge to it. also i smell the smoke a good clean hot burning wood fire should have a light pleasant smell to it almost sweet or lightly nutty vanilla smell to it coming out of the smokestack
hopefully some of this helps idk im kinda OCD about a good fire, but this pic is usually what i try to go for nice hot coalbed good flames and lots of airflow to the wood stacked nice and open so it burns well