Advantage of 2 smoke stacks?

[s1227]

Is there any advantage of putting two smoke stacks on smoker? Have seen some done like this where just one of the stacks was big enough to handle the smoker.

 

[gary s]

It's all about Ratio, and air flow.  Size of Cook Chamber, Fire Box, Stack along with the dampers, RF plate and Cooking great height are all relevant, To having a good properly working smoker, Check Dave Omak's post on the calculations

gary