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The low-risk column set as a reference where the amount of high risk and unclear risk will be relating to it

Am J Public Health

This method of analysis could provide multidirectional observations for each user of smokeless tobacco by continuous measurement of the factors that caused the smoking behavior according to the change of status including age [48]

Similar findings were found in EI Salvador study, which indicated that higher smoking rates are associated with good economic status 24 , as well as in studies conducted in India 1 and Nepal 22 , which found that greater economic status is an important factor for smoking among young adults and students, respectively