Charcoal canister replacement

By "smell", I'm assuming you mean the smell that accumulates in the closed garage due to fuel-evaporation?
When you run the EVAP system, to make it effective, you have to run a non-vented gas cap.
Speaking of effective; the canister, IMO, should have one line for each thing you want to collect from, and a purge line, and a signal line to control when to purge. You can get by with less.