To account for possible incomplete responses, 20% was added, resulting in a final sample size of 116 participants
A Study by Price Industries (PDF) contains many illustrations that could clear (pun intended) up the subject
Aldington S, Williams M, Nowitz M, Weatherall M, Pritchard A, McNaughton A, Robinson G, Beasley R
He found that despite the lack of evidence from the Treasury's revenue data, the Tobacco Institute of Southern Africa vehemently claimed that the illicit market had increased from being practically non-existent in the mid-1990s to 20% of the total market in 2006
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