Psychopharmacology

, Volume 233, Issue 15–16, pp 2933–2941

Self-titration by experienced e-cigarette users: blood nicotine delivery and subjective effects

  • Lynne E. Dawkins
  • Catherine F. Kimber
  • Mira Doig
  • Colin Feyerabend
  • Olivia Corcoran
Original Investigation

Abstract

Rationale

Self-titration is well documented in the tobacco literature. The extent to which e-cigarette users (vapers) self-titrate is unknown.

Objective

This study explored the effects of high and low nicotine strength liquid on puffing topography, nicotine delivery and subjective effects in experienced vapers.

Methods

Eleven experienced male vapers completed 60 min of ad libitum vaping under low (6 mg/mL) and high (24 mg/mL) nicotine liquid conditions in two separate sessions. Measurements included puffing topography (puff number, puff duration, volume of liquid consumed) and changes in plasma nicotine levels, craving, withdrawal symptoms, self-reported hit, satisfaction and adverse effects.

Results

Liquid consumption and puff number were higher and puff duration longer, in the low nicotine strength condition (all ps < 0.01). The mean difference in nicotine boost from baseline in the low condition was 8.59 (7.52) ng/mL, 16.99 (11.72) ng/mL and 22.03 (16.19) ng/mL at 10, 30 and 60 min, respectively. Corresponding values for the high condition were 33.77 (34.88) ng/mL, 35.48 (28.31) ng/mL and 43.57 (34.78) ng/mL (ps < 0.05). There were no statistically significant differences between conditions in self-reported craving, withdrawal symptoms, satisfaction, hit or adverse effects.

Conclusions

Vapers engaged in compensatory puffing with lower nicotine strength liquid, doubling their consumption. Whilst compensatory puffing was sufficient to reduce craving and withdrawal discomfort, self-titration was incomplete with significantly higher plasma nicotine levels in the high condition.

Keywords

Nicotine Titration E-cigarette Puffing topography Compensation 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Lynne E. Dawkins
    • 1
  • Catherine F. Kimber
    • 2
  • Mira Doig
    • 3
  • Colin Feyerabend
    • 3
  • Olivia Corcoran
    • 4
  1. 1.Division of Psychology, School of Applied SciencesLondon South Bank UniversityLondonUK
  2. 2.Drugs and Addictive Behaviours Research Group, School of PsychologyUniversity of East LondonLondonUK
  3. 3.ABS Laboratories Ltd.Welwyn Garden CityUK
  4. 4.Medicines Research Group, School of Health, Sport and BioscienceUniversity of East LondonLondonUK

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