Health Canada Intense Testing Regime for THS 2.2
Yields obtained under the Health Canada Intense Testing regime show that in the laboratory, the levels of HPHCs in THS 2.2 aerosol were reduced by 90-95%, on average, relative to the reference cigarette.
Prior to conducting the aerosol generation experiment, all test items were conditioned according to ISO 3402 conditions (22°C ± 1°C and 60% ± 2%). The laboratory condition set during the aerosol generation was maintained at 22°C ± 2°C and 60% ± 5% relative humidity.
All aerosol and smoke collections were performed according to the Health Canada Intense (HCI) machine-smoking protocol (55 mL puff volume, 30 seconds puff interval, 2 seconds puff, 100% vent blocking, butt length 23 mm for non-filter cigarettes or the length of filter overwrap plus 3 mm for filter brands) (Health Canada, 2000) on a linear smoking machine.
For the THS 2.2, the vent blocking does not apply as the tobacco sticks are not ventilated (no perforation at the filter level). The butt length does not apply either, as the sticks are not consumed by combustion and remain of the same size throughout use. The beginning and the end of the aerosol collection for the tobacco sticks differs from what is applied to a cigarette, as there is not ignition and the stick is not consumed by combustion. The aerosol collection starts after the pre-heating period (30 seconds) and stops at 6 minutes, which is the end of the heating period. This results in exactly 12 puffs under HCI.