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Nicotine and smoke/aerosol condensate dose-effect functions. Mean number of infusions as a function of dose. * indicates significant difference from saline vehicle (S) within dose-effect curve (p < 0.05); # indicates significant difference from nicotine-alone dose-effect curve for smoke/aerosol condensate at same nicotine dose (p < 0.05). n=13 for cigarette; n=16 for little cigar; n=15 for e-cigarette; n=14 for waterpipe.
