['The', 'pads', 'were', 'weighed', 'before', 'and', 'after', 'smoking.', 'The', 'WIPM', 'was', 'determined', 'by', 'taking', 'the', 'difference', 'between', 'these', 'two', 'weights.', 'The', 'sidestream', 'pads', 'were', 'extracted', 'and', 'the', 'chimneys', 'were', 'rinsed', 'with', 'isopropanol.', 'The', 'pad', 'and', 'chimney', 'extracts', 'were', 'analyzed', 'for', 'nicotine', 'and', 'water', 'by', 'gas', 'chromatography.', 'A', 'Beckman', 'DU-7', 'Spectrophotometer', 'was', 'zeroed', 'with', 'isopropanol', 'at', 'a', 'wavelength', 'of', '310', 'nm.', 'The', 'UV', 'absorbance', 'was', 'measured', 'on', 'an', 'aliquot', 'of', 'each', 'chimney', 'extract', 'against', 'the', 'isopropanol', 'reference.', 'The', 'instrument', 'was', 'then', 'zeroed', 'with', 'a', 'blank', 'pad', 'extract', 'solution', 'at', '310', 'nm.', 'The', 'UV', 'absorbance', 'was', 'determined', 'on', 'an', 'aliquot', 'of', 'each', 'sidestrcam', 'pad', 'extract', 'against', 'the', 'blank', 'pad', 'reference.', 'The', 'PMWNF', 'for', 'the', 'sidestream', 'pads', 'was', 'calculated', 'using', 'the', 'following', 'equation:', 'PMWHF', '(Pad)', '=', 'WIPM', '-', 'Pad', 'Nicotine', '-', 'Pad', 'Water', 'The', 'yield', 'of', 'PMWNF', 'on', 'the', 'chimneys', 'was', 'calculated', 'based', 'on', 'the', 'equation:', 'PMWNE', '(Pad)', 'x', 'Absorbance', '(Chimney)', 'dilution', 'PMWNF', '(Chimney)', '=', 'Absorbance', '(Pad)', 'RX', 'factor', ' ', 'where', 'the', 'dilution', 'factor', 'is', '0.25', 'me/cig.', 'The', 'mainstream', 'deliveries', 'were', 'measured', 'to', 'assure', 'that', 'there', 'were', 'no', 'leaks', 'in', 'the', 'system', 'during', 'the', 'smoking', 'procedure.', 'See', 'the', 'attached', 'data', 'sheet', 'for', 'a', 'more', 'detailed', 'summary', 'of', 'the', 'sidestream', 'and', 'mainstream', 'smoke', 'deliveries.', 'If', 'additional', 'work', 'is', 'necessary,', 'please', 'let', 'me', 'know.', 'T.', 'ALG.', 'TAC/bsf', '22285', 'Attachment', ' ', '682132672']