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Figure 4 Particle size fractions (x‐axis) and the particle number concentration (number per cm3) (y‐axis) for different smoking settings: full set experiments (charcoal, tobacco and water) (circles), experiments with charcoal and water only (squares) and for a cigarette (triangles). Note that the extracted volume was 1 litre for the waterpipe and 0.045 litre for the cigarette. (Measurements were performed with the WPS instrument.)
