Never having to smell someone's bad habit...
Smoke from cigarettes or marihuana must be kept as a personal choice. Adults with children should not pass along their own addiction at home. My invention would be in two pieces... One small tube to fit the cigarettes to contain the ash and smoke. Second piece would be a wallet-size reversed vacuum with a mask to be placed in the mouth at the moment of blowing out the smoke. Keeping the smell away from others, from the car, the casino and more importantly home.