The Canadian Intense (CI) smoking regime was derived from the existing ISO smoking procedure but no studies have been conducted on the impact of the intense regime on tar yield measurement. Recently, the ISO TC126 working group WG10 has been created to examine intense smoking regimes. In addition, questions have been raised by the scientific community regarding the accuracy of cigarette tar yields obtained at the CI smoking regime. To better understand the factors impacting tar determination at the CI smoking regime, Total Particulate Matter (TPM) determination was performed using 2 methods: weighing the Cambridge Filter Pad (CFP) and the holder together (ISO method) and separately (modified method), before and after smoking. The modified method allowed determining the exact mass of TPM from which nicotine and water yields are measured. It was shown that the ISO method overestimated by about 12 to 14% the mass of TPM that is actually extracted which resulted in a tar yield overestimation of about 20%. This difference in TPM mass was partly caused by volatile components released from the CFP holder upon its opening and also by residual mass left in the holder. Although several volatile organic compounds have been identified in the headspace of the holder, water was responsible for at least 50% of the TPM mass difference. More accurate values were obtained for TPM and tar by using the modified method. In addition, those tar yields better reflected the maximum exposure level observed in yield-in-use studies conducted with Canadian smokers. The use of the CI tar yields determined with the modified method lead to calculated tar/nicotine ratios similar to those obtained at the ISO smoking regime.