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. 2022 Jan 6;10(1):121. doi: 10.3390/biomedicines10010121

Figure 2.

Figure 2

Increase in parasympathetic activity in a volunteer when smoking two nicotine-free cigarettes (central points on the graph) with an interval of 90 min but not imitating smoking (Imit) in comparison with the pre-smoking and post-smoking stages.