Make a sploof. You need a toilet paper tube, dryer sheets, duct tape, and scissors. Take one dryer sheet, cut it into a smaller square so that it covers one end of the tub but is bigger enough to have some extra over the sides. Secure the extra around the sides of the tube with duct tape all the way around. Then take more dryer sheets, fold them individually inwards, and shove them down the tube until it's full. Get in the habit of blowing all smoke through the tube. Change the layers when they discolor and after the end discolors or the tube gets weird, make a whole new one.
-Febreeze.
-Scentsy, electric scented wax heaters (safer than candles and the smell doesn't linger like incense.)
-Glade plugins
-Timed scent dispensers
-Clean and vaccuum the room regularly.
-Hand pipes offer better smoke control (read: smell control) than waterpipes and waterpipes are better than joints/blunts. Vaporizers are the best. Edibles are good but making them can get stinky.