Smokers Snuffers Chewers Non-consumers Number 54 60 60 60 Men 54 60 21 27 Women 00 00 39 33 Mean age (years) 37. 68 ± 9.65 37.95 ± 9.46 41.26 ± 11.37 38.54 ± 10.08

Table 1: Distribution of the study’s subjects.