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. Author manuscript; available in PMC: 2023 Dec 1.
Published in final edited form as: Prev Med. 2022 Aug 19;165(Pt B):107213. doi: 10.1016/j.ypmed.2022.107213

Table 1.

Average cigarettes per day (CPD) reported at Week 12.

Mean Difference (95% CI) p-value1
Main effects model 1
Cigarette Nicotine Content: VLNC (vs. NNC) −12.96 (−21.51, −4.42) 0.005
E-Liquid Nicotine Content: Moderate (vs. Low) −3.52 (−11.67, 4.64) 0.383
E-Liquid Flavor Availability: All Flavors (vs. Tobacco Flavors) −2.21, (−10.21, 5.78) 0.573
Cigarette Nicotine Content x E-liquid Nicotine Content model 1 0.061
 VLNC vs NNC, Moderate Nicotine E-liquid −22.6 (−35.56, −9.64) 0.001
 VLNC vs NNC, Low Nicotine E-liquid −7.22 (−17.32, 2.87) 0.152
Cigarette Nicotine Content x E-liquid Flavor Availability model 1 0.061
 VLNC vs NNC, All E-liquid Flavors −20.81 (−32.37, −9.25) 0.001
 VLNC vs NNC, Tobacco E-liquid Flavors −7.13 (−17.29, 3.02) 0.160

Normal Nicotine Content (NNC) Cigarettes: 15.8 mg nicotine per gram of tobacco

Very Low Nicotine Content (VLNC) Cigarettes: 0.4mg nicotine per gram of tobacco

Moderate Nicotine E-liquid: 1.8% free-base nicotine

Low Nicotine E-liquid: 0.3% free-base nicotine

All E-liquid Flavors: 12 flavors available to choose from, including: robust tobacco, light tobacco, tobacco/menthol blend, mixed berry, watermelon, berry, cookies and crème, chocolate, caramel, spearmint, peppermint, and menthol.

Tobacco E-liquid Flavors: 3 flavors available to choose from, including: robust tobacco, light tobacco, tobacco/menthol blend.

1

adjusted for baseline CPD, site, menthol status, and age group