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Psychopharmacology

, Volume 175, Issue 2, pp 134–142 | Cite as

Nicotine serves as an effective reinforcer of intravenous drug-taking behavior in human cigarette smokers

  • Deon M. Harvey
  • Sevil Yasar
  • Stephen J. Heishman
  • Leigh V. Panlilio
  • Jack E. Henningfield
  • Steven R. Goldberg
Original Investigation

Abstract

Rationale

Although numerous studies have documented that nicotine can function as an effective reinforcer of intravenous self-administration behavior in animals, it has not been clearly shown to maintain intravenous self-administration behavior above vehicle placebo levels in humans.

Objectives

To compare the reinforcing effectiveness of nicotine versus saline placebo in human research volunteers responding under fixed-ratio (FR) schedules of intravenous drug self-administration while systematically increasing response requirements.

Methods

Eight male cigarette smokers resided in an inpatient research unit. During 3-h sessions, intravenous injections of nicotine and saline were available concurrently and were contingent on responding (pulling a lever). Nicotine dose (0.75, 1.5, 3.0 mg/injection), time out (TO) value after each injection (1–20 min) and FR response requirement (10–1600) were varied in different subjects over consecutive sessions.

Results

Number of nicotine injections/session significantly decreased as dose/injection increased and the number of self-administered nicotine injections was significantly greater than the number of self-administered saline injections across conditions. When FR value was progressively increased over sessions, response rates for nicotine, but not saline, injections increased, with maximal rates at the highest FR values. Rates of responding and injections/session were markedly and significantly higher for nicotine than for saline at FR values of 200 and above. Subjects rated effects of nicotine as both significantly more positive and more negative than saline placebo, with positive ratings significantly higher than negative ratings.

Conclusions

Nicotine functioned as a prototypic drug of abuse, serving as an effective reinforcer of intravenous drug-taking behavior in human cigarette smokers. Subjects adjusted their responding to response requirements in a way that maintained relatively constant levels of nicotine injections per session.

Keywords

Nicotine Human Tobacco, smoking behavior Drug self-administration Intravenous Fixed-ratio schedule 

Notes

Acknowledgements

This study was supported by NIDA, NIH and DHHS. We would like to thank Drs. David Epstein and Zuzana Justinova for their help in analyzing the data and Mr. Richard Taylor for his help in retrieving subject histories.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Deon M. Harvey
    • 1
  • Sevil Yasar
    • 2
    • 3
  • Stephen J. Heishman
    • 1
  • Leigh V. Panlilio
    • 4
  • Jack E. Henningfield
    • 5
    • 6
  • Steven R. Goldberg
    • 4
  1. 1.Clinical Pharmacology and Therapeutics Branch, National Institute on Drug Abuse, NIHDHHSBaltimoreUSA
  2. 2.Division of Geriatric Medicine and Gerontology, Department of MedicineJohns Hopkins University School of MedicineBaltimoreUSA
  3. 3.Behavioral Neurosciences Section, National Institute on Drug Abuse, NIHDHHSBaltimoreUSA
  4. 4.Preclinical Pharmacology Section, National Institute on Drug Abuse, NIHDHHSBaltimoreUSA
  5. 5.Department of Psychiatry and Behavioral SciencesJohns Hopkins University School of MedicineBaltimoreUSA
  6. 6.Pinney AssociatesBethesdaUSA

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