A key indicator of nicotine dependence is associated with greater depression symptoms, after accounting for smoking behavior
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Introduction Depression is a global burden that is exacerbated by smoking. The association between depression and chronic smoking is well-known; however, existing findings contain possible confounding between nicotine dependence (ND), a latent construct measuring addiction, and objective smoking behavior. The current study examines the possible unique role of ND in explaining depression, independently of smoking behavior. Methods A nationally-representative sample of current adult daily smokers was drawn by pooling three independent, cross-sectional, biennial waves (spanning 2011–16) of the National Health and Nutrition Examination Survey (NHANES). The association between ND (operationally defined as time to first cigarette (TTFC) after waking) and the amount of depression symptoms was examined after adjusting for both current and lifetime smoking behaviors (cigarettes per day and years of smoking duration) and sociodemographic factors (gender, age, race, education and income to poverty ratio). Results Earlier TTFC was associated with more depression symptoms, such that those smoking within 5 minutes of waking had an approximately 1.6-fold higher depression score (PRR = 1.576, 95% CI = 1.324–1.687) relative to those who smoke more than 1 hour after waking. This relationship remained significant after adjusting for current and lifetime smoking behavior as well as sociodemographic factors (PRR = 1.370, 95% CI = 1.113, 1.687). Conclusions The latent construct of ND, as assessed by TTFC, may be associated with an additional risk for depression symptoms, beyond that conveyed by smoking behavior alone. This finding can be used for more refined risk prediction for depression among smokers.Keywords:
Depression
Nicotine Addiction
An array of pharmacological and environmental factors influence the development and maintenance of tobacco addiction. The nature of these influences likely changes across the course of an extended smoking history, during which time drug seeking can become involuntary and uncontrolled. The present study used an animal model to examine the factors that drive nicotine-seeking behavior after either brief (10 days) or extended (40 days) self-administration training. In Experiment 1, extended training increased rats' sensitivity to nicotine, indicated by a leftward shift in the dose-response curve, and their motivation to work for nicotine, indicated by an increase in the break point achieved under a progressive ratio schedule. In Experiment 2, extended training imbued the nicotine-paired cue with the capacity to maintain responding to the same high level as nicotine itself. However, Experiment 3 showed that the mechanisms involved in responding for nicotine or a nicotine-paired cue are dissociable, as treatment with the partial nicotine receptor agonist, varenicline, suppressed responding for nicotine but potentiated responding for the nicotine-paired cue. Hence, across extended nicotine self-administration, pharmacological and environmental influences over nicotine seeking increase such that nicotine seeking is controlled by multiple sources, and therefore highly resistant to change.
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Varenicline
Nicotine Addiction
Nicotine dependence
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Nicotine Addiction
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Bupropion
Nicotine dependence
Nicotine withdrawal
Nicotine Addiction
Nicotine replacement therapy
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"Neoceader smoking" is widely marketed in drug stores as an over the counter expectorant for cigarette smokers in Japan. Using high-pressure liquid chromatography, we determined that one piece of Neoceader (3 cm) contains 0.79 mg of nicotine, which is equivalent to one-sixth of the amount of nicotine in one Japanese cigarette (Mildseven extra-light, Mildseven super-light, or Sevenstar). Two patients who had switched from cigarette smoking to Neoceader smoking, subsequently became addicted to nicotine. The continine concentration in their urine were 937 ng/ml and 2,724 ng/ml, respectively. These findings demonstrate that Neoceader contains nicotine and that its use can lead to nicotine addiction.
Nicotine Addiction
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Views questioning the addictiveness of nicotine continue to be expressed in some quarters. Patterns of use by smokers and the remarkable intractability of smoking point to compulsive use as the norm. Studies in animal and human subjects have shown that nicotine can function as a reinforcer, but under a rather limited range of conditions. There is a resemblance between the discriminative stimulus and other effects of nicotine, amphetamine and cocaine. There is a well-defined nicotine withdrawal syndrome that is alleviated by nicotine replacement. Thus, the evidence identifies nicotine as an addictive agent, comparable to heroin and cocaine.
Nicotine Addiction
Nicotine withdrawal
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Nicotine addiction represents a major health problem in the world with dramatic socio-economic consequences. Recent studies using genetically modified mice have provided a better understanding of the neurobiological mechanisms involved in nicotine responses. However, the study of nicotine addiction requires sophisticated behavioural models that are still not fully developed in mice. Here, we report the validation of a new reliable operant model of nicotine-seeking behaviour in mice. C57BL/6 mice were trained to self-administer nicotine (0.03 mg/kg per infusion) under a fixed ratio 1 schedule of reinforcement for 10 d. A light cue was contingently associated with the nicotine infusion. After reaching the acquisition criteria of nicotine self-administration, mice were exposed to extinction sessions similar to the self-administration training except that nicotine was not available and the associated cues were not presented. Nicotine-seeking behaviour was then reinstated by exposure to nicotine-associated environment cues, a priming injection of nicotine or stress, the three main conditions leading to nicotine relapse in humans. The exposure to the cues associated with nicotine infusion was the most effective stimulus reinstating nicotine-seeking behaviour in 90% of mice. A priming injection of nicotine (0.18 mg/kg) produced nicotine reinstatement in 30% of the animals, whereas stress exposure (0.22 mA footshock) reinstated nicotine-seeking behaviour in 50% of mice. The validation of this new model of nicotine-seeking behaviour and reinstatement in mice provides an important tool to help clarify the genetic and neurochemical bases of nicotine addiction.
Self-administration
Nicotine Addiction
Nicotine withdrawal
Neurochemical
Priming (agriculture)
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A study was made of the possibility of forming nicotine addiction in laboratory rats and using it as the basis for the design of experimental nicotine toxicomania. Experiments were carried out on 56 rats placed in individual cages with a possibility of free choice between water and 0.005% nicotine solution for 2 to 4 months. It was established that the population of intact laboratory rats with 8- and 16-week contact with nicotine solution could be divided into groups demonstrating 3 main types of attitude toward nicotine: aversion (68% of all the animals), moderate addiction (4%), and pronounced addiction (28%). These quantitative relationships remained unchanged whatever the time of contact with nicotine. Thus, the possibility has been shown of designing experimental nicotine toxicomania with marked elements of physical dependence in rats consuming nicotine on a voluntary basis.
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Abstract Objectives: This paper examines whether historical disparities in periodontal status between African Americans and whites in the United States have increased, decreased, or remained the same over the 15‐year period between the First National Health and Nutrition Examination Survey (NHANESI,1971–74) and the Third National Health and Nutrition Examination Survey (NHANES III, 1988–94). Methods: This study compared the magnitude of the relative and absolute differences in the periodontal status of African‐American and white adults in NHANES I and again in NHANES III. Results: The prevalence of periodontitis in the US adult population in NHANES I was 31.6 percent, with African Americans exhibiting higher prevalence than whites. In NHANES Ill, using a different case‐definition for periodontitis, the overall prevalence was 11.9 percent, with African Americans again exhibiting higher prevalence than whites. The magnitude of the intrasurvey relative and absolute differences between African Americans and whites increased between NHANES I and NHANES III. This finding remained after adjustment in the logistic regression analyses. After adjustment for all covariates in the model, African Americans were more likely to exhibit periodontitis than whites in both NHANES I (odds ratio [OR]=1.31; 95% confidence intervals [CI]=.78, 2.19) and NHANES Ill (OR=2.09; 95% CI=1.68, 2.60). However, the CI included 1.00 in NHANES 1. Conclusions: Disparities in pendontitis between African Americans and whites are pervasive and have increased over time. This increase appears to be driven by social, cultural, and behavioral factors.
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Non-Hispanic whites
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Abstract Nicotine is a principal psychoactive agent in tobacco, contributing to tobacco’s addictive potential. Preclinical studies on the effects of voluntary nicotine intake typically use self-administration procedures that provide continuous nicotine access during each self-administration session. However, many smokers consume cigarettes intermittently rather than continuously throughout each day. For drugs including cocaine and opioids, research in laboratory rats shows that intermittent intake can be more effective than continuous intake in producing patterns of drug use relevant to addiction. We asked, therefore, how intermittent versus continuous nicotine self-administration influences nicotine seeking and taking behaviours. Female and male rats had continuous (i.e., Long Access; LgA, 6 h/day) or intermittent (IntA; 12 min ON, 60 min OFF, for 6 h/day) access to intravenous nicotine (15 µg/kg/infusion), for 12 daily sessions. We then assessed intake, responding for nicotine under a progressive ratio schedule of drug reinforcement and cue- and nicotine-induced reinstatement of drug seeking. We also estimated nicotine pharmacokinetic parameters during LgA and IntA self-administration. Overall, LgA rats took twice more nicotine than did IntA rats, yielding more sustained increases in estimated brain concentrations of the drug. However, the two groups showed similar motivation to seek and take nicotine, as measured using reinstatement and progressive ratio procedures, respectively. Thus, intermittent nicotine use is just as effective as continuous use in producing addiction-relevant behaviours, despite significantly less nicotine exposure. This has implications for modeling nicotine self-administration patterns in human smokers and resulting effects on brain and behaviour.
Self-administration
Nicotine Addiction
Drug intoxication
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