I get some smoke that leaks out from the bottom right corner of the door, but not nearly the amount of smoke that comes out from the top of the smoker. I have noticed, as Sarge points out, that if it is windy (my smoker is on the deck), the smoke coming from the top hole is not as noticeable as the wind blows the smoke around the top of the smoker. When it is not windy, the smoke streams straight up from the smoker as is very noticeable.
How much wood are using? I use around 5oz (one or two chunks of wood) and I get a lot of smoke in the first heating cycle.
Is the top hole somehow blocked/obstructed? I am baffled as to why the smoke would not rise and exit the top of the smoker!