I'm going to ask a question I haven't seen anybody else here yet, what state do you live in? I don't give a shit about laws I'm more curious about what your climate is?
Realize that whatever are your pushing out, whatever cubic feet per minute you're pushing out, your also sucking in from outside.
I tried a vented for my first grow with the same fears you have, and I will never do it again. Pretty sure I spent more trying to keep things cool while constantly sucking in hot summer outside air.
If your somewhere with high humidity, heat, or extreme cold any of the times you're wanting to grow, you may have a really rough time at it.
I grow in my garage in Southern Illinois now, I use a filtration system that blows into a cabinet that I keep odor gel in. I have no smell issues. But even still, I only grow in the garage August-May and try to harvest and be shut down by May 1st due to the humidity from mid May to October. 100% in summer here, its terrible.