Comparison of the 1C2 Reference Filtered Cigar to the 1R6F Reference Filtered Cigarette.

Area of Science:

• Tobacco Product Science
• Toxicology
• Cell Biology

Background:

• Filtered cigars are a tobacco product category consumed similarly to conventional cigarettes.
• Understanding their comparative toxicity is crucial for public health assessments.

Purpose of the Study:

• To compare the toxicological effects of filtered cigar smoke condensates with those of conventional cigarette smoke condensates.
• To evaluate effects on cell proliferation, viability, and aryl hydrocarbon receptor (AhR)-mediated gene expression.

Main Methods:

• Preparation of tobacco smoke condensates using ISO, Health Canada Intense (HCI), or Cigar Smoking regimens.
• Assessment of cell proliferation and viability in human bronchial and oral epithelial cell lines.
• Measurement of AhR-mediated gene expression using a mouse hepatoma cell line.

Main Results:

• The HCI regimen yielded higher total particulate matter (TPM), AhR-mediated gene expression, and toxicity when normalized to filler weight.
• Filtered cigar (1C2) condensates induced greater AhR-mediated gene expression and reduced cell viability compared to reference cigarette (1R6F) condensates, normalized to filler weight.
• Filtered cigars demonstrated higher toxicity than reference cigarettes when compared by filler weight.

Conclusions:

• The reference filtered cigar (1C2) exhibits greater toxicity than the reference cigarette (1R6F), particularly under the HCI regimen.
• Findings suggest that some commercial filtered cigars may pose at least as significant health risks as conventional cigarettes.
• Inhalation of filtered cigar smoke by consumers may lead to harm comparable to that from conventional cigarettes.