http://img97.imageshack.us/i/picture620.jpg/
http://img29.imageshack.us/i/picture626q.jpg/
http://img268.imageshack.us/i/picture628k.jpg/
http://img29.imageshack.us/i/picture640h.jpg/
I would have to say, it is not too much as long as it is not stagnet (sp?), you need to keep a good flow of smoke across the meat. If it has good flow you should be fine. If its just lingering there then IMHO you have a problem.
lets hope its not stagnet
i normally cook 4 to 6 briskets a week
(http://img24.imageshack.us/img24/6647/picture660.th.jpg) (http://img24.imageshack.us/i/picture660.jpg/)