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At least, that's how I always viewed it

Somerville et al., 2013

Ultra-Smooth Filtration The enhanced filtration system in Ultra Blue extends beyond standard cigarette filters, incorporating additional particle-capture stages that prevent the harsh throat feel that often accompanies drastic strength reduction

Lastly, neither CO levels in expired air nor cotinine levels in blood were assessed in this study, which could have provided more clarity in the results obtained, particularly when defining a participant as a current smoker