burn incense regularly, blow smoke into kitchen fan or bathroom fan, take an empty toilet paper role and wrap it twice with toilet paper put some baby powder in between and exhale into it. use perfume or cologne liberally, febreeze air spray where you smoke, gum for fresh breath, eye drops for red eye, hand sanitizer for clean hands, maybe a pillow if you start to cough frequently and all sorta stealth hidden areas for your stash/pipes, makeshift props should work. to get the smell out fast put a small fan near an open window and let the draft do the rest. all of this has helped me in the past.