An international team of American, Danish and Taiwanese researchers monitored more than 61,000 Chinese inhabitants of Singapore between 1993 and 2005. The participants were aged between 45 and 74 and none of them was suffering from cancer at the start of the study. All completed a questionnaire regarding their diet and lifestyle.

Twelve years later, the authors recorded 325 cases of cancer of the respiratory tract (nose, sinus, tongue, mouth, etc) within the cohort. We have shown that prolonged use of incense is associated with a significant increase in the risk of cancer of the respiratory tract, the scientists explain. They point out that prolonged use of incense is particularly common on the continent of Asia. But it is also used regularly in the West too.

Back in 2004, in France, the magazine Que-Choisir had already raised the alarm. According to their investigations, incense sticks emitted 110 times more benzene (a highly carcinogenic substance) into the atmosphere than the level public authorities recommend. So it’s time for some common sense advice: if there is an unpleasant smell in your house or apartment you may be better off with your windows open.