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Wear an old jacket or sweatshirt while you smoke. Smoke into a paper towel tube. Bring extra clothes if you don't have time to change at home. Wash dirty clothes.
Then, before you return home, take off the jacket or sweatshirt and hide it. The outer layers will absorb most of the cigarette smell, and will also protect your clothes from falling ash. Take the tube from an empty paper towel roll, and place several dryer sheets at the end. As you smoke, exhale through the tube. The dryer sheets help to prevent the smoke from dispersing and clinging to your clothes and hair. When you are done smoking, completely change into the fresh, clean clothes. Hide the dirty clothes until you have the opportunity to launder them. Make sure that your spare clothes are in a completely sealed bag. If you don't have a bag, make sure you place your extra clothes a good distance away from where you are smoking. If the smoke gets onto the spare clothes, they won't do you much good. If your clothes smell of smoke, you will need to either discard them or find a way to remove the smell. Body sprays and air-fresheners will only temporarily mask the scent; your clothing will need to be washed. If your clothes smell strongly of smoke, place them in a large bag (preferably a large zippered bag) and add at least ½ cup of baking soda. Shake the bag and then seal it as tightly as possible. Let the clothes sit overnight, and the baking soda will absorb the odors. Then, shake the clothes and run them through the washing machine.  Pre-soaking your clothes in vinegar also helps to remove the smell of smoke. Fill a sink with warm water, and then add 1 cup of vinegar. Let the clothes soak for 30-60 minutes, and then wash them as usual. If you are using these special laundry techniques, make sure your parents don’t see you. They may be suspicious that you are trying to cover up incriminating smells.