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They measured the amount of carbon monoxide breathed out by five student volunteers who smoked two vegetable-based cigarettes. In two students, the carbon monoxide concentrations after the first vegetable-based cigarettes online rose from 15 parts per million to 21 parts per million in one, and from 14 parts per million to 26 parts per million in the other. Smoking the second cheap cigarettes led to higher carbon-monoxide concentrations being reached by both students. Dr Ernest Groman and colleagues conclude that vegetable-based cigarettes are “a potential hazard to health”. They emphasise that current treatment of nicotine dependence should consist of a combination of nicotine substitution and behavioural therapy or psychological procedures without medication. Carbon monoxide is an odourless, colourless and tasteless gas. In high concentrations - far higher than in cigarettes - it can be deadly. Symptoms of carbon monoxide poisoning include headache, dizziness, irritability and difficulty breathing.