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Incense (Bokhour) is an oleoresin that oozes from incisions in the trunks and leaves of trees of the ge­ nus Boswellia (B. carterii and B. papyrifera, native to Arabia, Africa and India).1 In Arabian cultures the incense is traditionally burnt for several domestic purposes, airborne pigmented and depigmented dermatitis have been reported as being caused by incense.2 Several investigators in Asia and North America have investigated possible links between incense stick exposure and health problems.3-5 Extensive indoor incense exposure has been reported as a risk factor for obstructive lung disease in non-smoking Saudi women.6 A significant as­ sociation between lung cancer risk factors and incense stick exposure has been reported.7,8 In addition, Arabian incense exposure was an important precipitating factor in about 18% of 414 asthmatic children ranging in age from 7 months to 12 years in Qatar.9 As far as we know, these reports are the only studies related to the effect of Arabian incense (Bokhour) on lung morphology. The association between exposure to Arabian incense (Bokhour) and the effect on human health has not been investigated deeply. In this investigation, our interest was to study the histological characteristics of two kinds of popular, commercially avail­ able incense.

Histological changes in the lung of Wistar albino rats ( Rattus norvegicus ) after exposure to Arabian incense (Genus Boswellia )