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Thanks for your question! A gas treatment would certainly remove cigarette odor. Follow these instructions:
Close all outside doors, windows, shades, curtains (no sunlight should enter the room/house/building), aeration/ventilation.
If you can not close the ventilation, seal it with tape.
Leave the inside closet/bathroom door opened.
Remove any pets and plants.
Place a recipient like a plastic bucket in the middle of the room with about 2 cups / 0.5 liter of water.
Add the tablets in warm water slowly.
The regular dosage is 250 tablets (250 grams/half a bag) for 1 quart / 1 liter of water.
250 tablets (250 grams/half a bag) will cover about 250 square feet.
If your room is 1000 square feet, place 4 buckets equally in the room, and in each bucket add 250 tablets in 1 quart of water.
Do not breathe the gas coming out, you can also wear a mask or a gas mask better. Leave the rooms asap, and close the door behind you.
Chlorine Dioxide Gas is generated immediately and you do not need aerators/ventilators/pumps/airstones to disperse the gas…
Close the door (you can also seal the door with tape, so chlorine dioxide smell does not spread in other parts of your home). Leave the clo2 gas for 24 hours or more depending on the severity.
Open all doors, windows, ventilation to air-out. It could be from 30 minutes to a few hours depending on the ventilation. Basements usually need 6 hours to air out due to lack of ventilation and windows.
Before re-occupying the room, if you smell a chlorine-like odor, continue to air-out the room.
ClO2 gas application does not require any rinsing or wiping. Simply air out the confined space before re-occupying it.