While Shisha smoke is less irritating to the throat, it still contains tar, carbon monoxide, and nicotine. The smoothness of Shisha smoke may actually encourage deeper inhalation and thus greater exposure to these elements. The British Heart Foundation found that the average Shisha session lasts an hour, but you can inhale the same amount of smoke as 100 cigarettes in this period alone. The average cigarette requires 20 puffs whereas a Shisha session involves 200 puffs, causing a person to inhale approximately 90,000 millilitres of smoke compared to the 500-600 millilitres inhaled when smoking a cigarette. Even someone smoking over 20 cigarettes per day who can be classified as a ‘heavy smoker’ would still take over one week to cause the same amount of harm to themselves as a one-hour Shisha session.