Table 2.

Concentrations of nicotine and cotinine levels in saliva.

Parameter	Groups
	Controls	Smokeless Tobacco users (SLT)
		Gutkha users	Khaini users
Nicotine (ng/ml)	34.23 ± 2.87	3712.12 ± 522.21*	3556.96 ± 253.82*
Cotinine (ng/ml)	40.91 ± 3.45	7248.04 ± 958.10*	5326.90 ± 656.94*

Data are represented as the mean ± SEM and * denotes that data are significantly different with the other groups.