MES 30 duct modification question

 I would rather not have tons of smoke at ground level.... I realize smoke will inevitably leak out of other places and will pour out when i open the door

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It is easy to generate thick smoke if you load up the chip tray too much. You should put only enough chips in to generate a thin blue smoke (TBS). You might also consider getting a AMNPS. It generates a TBS that is not very noticable.  You may decide you do not need the pipe.

As pointed out TBS isn't a lot of smoke and usually isn't annoying.  I'm not sure how a long piece of duct would affect drafting, you might want to transition from a 3" at the vent to 4 or 5 inch.  It may not be a factor at all.  You can go down to a HVAC supply outlet "wholesaler", they sell 3" and 4" aluminum in 10' lengths for bath vents, it is flexible and semi rigid.

Our previous house, I had my MES 40 under the eave, and tried using it there, the smoke would get into the eave vents and the whole house would smell like BBQ.  So I tried pulling the smoker out 6 to 10 ft and depending on the wind the same thing would happen.  To solve the problem I simply duct taped the two eave vents in that area, and no more smoky BBQ smell in the house - problem solved.  I could even smoke under the eave again, especially in the winter.