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. 2011 Dec 20;8(12):e1001145. doi: 10.1371/journal.pmed.1001145

Figure 3. Graphical display of smoke constituents per cigarette and per unit of nicotine for ingredient group 2.

Figure 3

Low levels of additives are open circles, high levels are solid circles. Points outside the circle at 100% indicate increased levels of smoke constituents; points inside indicate less.