<prompt> Reverse smoking is common in:MaharashtraGujaratAndhra PradeshRajasthan  <response>: Reverse chutta crude form of cigar smoking, practised especially among females of Srikakulam district of Andhra Pradesh, recorded a prevalence of 8.8 of leukoplakia, 4.6 preleukoplakia and 17.9 leukokeratosis nicotina palati Daftary et al, 1992.Palatal involvement was noted in 85 of the leukoplakia cases and in 57 of the preleukoplakias, and, of course, in all of the cases of Ieukokeratosis nicotina palati. Palatal changes associated with reverse smoking thus exhibited a spectrum of clinical changes, and it was not satisfactory to group them under leukoplakia, preleukoplakia or leukokeratosis nicotina palati.Reference: Shafers Textbook of ORAL PATHOLOGY Eighth Edition page no 145 