Some research suggests that those who smoke menthol cigarettes take in a higher concentration of carcinogens and experience more smoking-related illnesses than do people who smoke regular cigarettes. This may be because when smoking menthol cigarettes, the pleasant, cooling sensation causes the user to inhale more tobacco smoke with each drag. This extra intake of carcinogenic substances by menthol smokers may be the cause of higher incidences of smoking-related sicknesses. As a result, menthol cigarette smokers may become more quickly addicted and also may smoke more cigarettes than those who smoke non-mentholated cigarettes. The cycle repeats, with smokers continuing to smoke more cigarettes to feed the addiction. Thus, smokers of menthol cigarettes have a higher rate of smoking-related ailments than smokers of regular cigarettes.