4 cigarettes a week Pioneers in Biomedical Research Seminar: Reducing the Harms from Tobacco Through Nicotine Regulation Tobacco smoking - Wikipedia

The production of different types of cigarettes from different tobaccos that are produced in different regions and under different cultivation conditions, as well as the use of different additives in different cigarette factories, causes the variation in potential for the presence of pollutants in the cigarette smoke of different brands

Most airports have designated smoking/vaping areas outside the terminal or no indoor areas at all

Risks associated with smoking cigarettes having low machine-measured yields of tar and nicotine

This table of cigar sizes will give you a good idea: It does bear emphasis that cigar sizes are not standardized across the industry