Marlboro UltraSmooth: a potentially reduced exposure cigarette?

Area of Science:

• Tobacco Product Analysis
• Toxicological Risk Assessment
• Public Health

Background:

• Cigarette design innovations aim to reduce harm, but their effectiveness requires rigorous evaluation.
• Carbon filters are incorporated into some cigarette designs to potentially lower toxicant exposure.
• Understanding toxic emissions under various smoking conditions is crucial for public health assessments.

Purpose of the Study:

• To compare the relative toxic emissions scores (RTE) of Marlboro UltraSmooth (MUS) cigarettes against regular Marlboro, Holiday, and British Columbian (BC) brands.
• To assess the performance of MUS cigarettes with combined acetate-carbon filters under different machine-smoking conditions.

Main Methods:

• Cigarettes were tested under International Organization for Standardization (ISO) and Health Canada Intensive (HCI) machine-smoking conditions.
• Relative Toxic Emissions (RTE) were calculated per brand and per milligram of nicotine.
• Toxicants were selected based on toxicological risk assessment, with BC brands serving as the reference standard.

Main Results:

• Under ISO conditions, MUS showed significantly lower RTE compared to regular brands.
• Under HCI conditions (simulating smoker behavior), MUS RTE increased substantially, ranking sixth highest among 18 brands when normalized for nicotine.
• MUS filters contained a significant amount of carbon and were highly ventilated, but this did not translate to reduced harm under realistic conditions.

Conclusions:

• Marlboro UltraSmooth (MUS) cigarettes are not a potentially reduced-exposure product (PREP) under smoker-realistic test conditions.
• The design of MUS did not reduce overall toxic emissions, carcinogens, or cardiovascular toxicants compared to most regular brands under HCI testing.
• Significant design changes in cigarettes, like MUS, are unlikely to reduce smoking-related mortality risks to acceptable levels.