Sir,The report on “tobacco Dust induced genotoxicity as an occupational hazard in workers of bidi making cottage industry of central India” is very interesting.[1] Khanna et al. noted that “bidi rollers seem to be facing the occupational hazard of genotoxicity due to handling bidi tobacco and inhalation of tobacco dust.[1]” Indeed, this topic is not a new thing. Previously, Mahimkar and Bhisey reported that “occupational exposure to bidi tobacco increases chromosomal aberrations in tobacco processors.[2]” Mahimkar and Bhisey reported for “a significant increase in deletion fragments and chromatid gaps in the exposed group.[2]” However, based on the present report by Khanna et al.,[1] it can confirm only that there is genotoxicity; however, the relationship to exposure might not be concluded. In fact, to confirm the exposure, biomarker monitoring is required. The available biomarkers include blood and urine levels including cotinine, thioethers, etc.[34]