I would not stop my grow if I were you. Then again, I'm not you... I only grow outdoors because in my state the cops can take my house if they catch me growing and it isn't worth the risk. Plus they are kicking in the wrong door all the time in my city because people put fake addresses on probation paperwork and the cops actually get bad warrants.

Anyway, back to you... If I were you I would just make my grow extra stealth. From down the street I bet he couldn't smell it anyway. My upstairs neighbor (in a condo) grows (I think) and I can only smell it when I'm directly in front of my building near his air vent. If I walk 30 feet I can't smell a thing. But nonetheless I would go stealth by totally sealing my grow room and using multiple carbon filters on all the exhaust so as to greatly reduce the smell. I would also run another carbon filter just in the room itself. It would be time consuming and cost a few bucks, but that is what I would do. Once you had everything installed, it would be cheap to maintain. And the fans don't cost much to run.

As far as smoking, if you set up your grow room right you could always smoke in there. But if I were you I'd just keep burning in the garage. Again, if he were down the street he wouldn't smell a damn thing, most likely. You could throw a carbon filter in there if you wanted, too.