Open the windows and doors to the house for a good old-fashion airing out. This gives the smoke somewhere to go besides being stuck in a confined space. Avoid aerosol air fresheners because they simple cover up the odor and do not eliminate it.
Turn on the fans. Exhaust fans and space fans can be very efficient in clearing out cigarette smoke from a room. With the windows open, the fans will push the smoke and odor from the room.
Sprinkle baking soda on the carpet and furniture of the room. Let the baking soda sit undisturbed for a couple of hours and vacuum the rest up. Baking soda is a great odor-removing trick that has been used for decades.
Peel some oranges. Oranges are great natural air fresheners for clearing out cigarette smoke and the smell because the citrus in the orange can over-power the smoke.
Do laundry. While aerosol air fresheners are ineffective for clearing out cigarette smoke and its odor, soap is great for getting rid of the odor. It is also an efficient way to clear smoke from your room, and do a chore all at the same time.