You could hang around the humidifier, too
Sometimes, though, the lot number is printed on a strip that you may rip off when you open the bag or its printed on the cans lid
Sure, if you participate for 5 minutes once a month the effect is minimal but the quantity of smoke is so great that the average smoking session is really harmful not to mention the added second hand smoke which makes it still more dangerous

The health benefits over time of stopping smoking include: [223] Within 20 minutes after quitting, blood pressure and heart rate decrease Within a few days, carbon monoxide levels in the blood decrease to normal Within 48 hours, nerve endings and sense of smell and taste both start recovering Within 3 months, circulation and lung function improve Within 1 year, there are decreases in cough and shortness of breath Within 12 years, the risk of coronary heart disease is cut in half Within 510 years, the risk of stroke falls to the same as a non-smoker, and the risks of many cancers (mouth, throat, esophagus, bladder, cervix) decrease significantly Within 10 years, the risk of dying from lung cancer is cut in half, and the risks of larynx and pancreas cancers decrease Within 15 years, the risk of coronary heart disease drops to the level of a non-smoker