Evidence map›Paper›PMID 33456434›Full record

ReviewTobacco induced diseases2021

The effect of e-cigarettes on smoking cessation and cigarette smoking initiation: An evidence-based rapid review and meta-analysis.

Ying-Ying Zhang, Fan-Long Bu, Fei Dong, Jian-Hua Wang, Si-Jia Zhu, Xiao-Wen Zhang, Nicola Robinson, Jian-Ping Liu

Abstract readReview
In one paragraph

Review in Tobacco induced diseases, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 33 papers, 7 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
33citing papers in PubMed, 7 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

33 citing papers in PubMed, 7 syntheses or guidelines pooled it.

  1. Pooled it
  2. Electronic cigarettes for smoking cessation.The Cochrane database of systematic reviews · 2025
    Pooled it
  3. Pooled it
  4. Electronic cigarettes for smoking cessation.The Cochrane database of systematic reviews · 2024
    Pooled it
  5. Electronic cigarettes for smoking cessation.The Cochrane database of systematic reviews · 2022
    Pooled it
  6. Electronic cigarettes for smoking cessation.The Cochrane database of systematic reviews · 2021
    Pooled it
  7. Electronic cigarettes for smoking cessation.The Cochrane database of systematic reviews · 2021
    Pooled it
  8. Trial
  9. Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Perspectives of Sexual and Gender Minority Youth on Anti-Vaping Messages in Social Media.Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco · 2025
    Article
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  18. Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

Ying-Ying ZhangCentre for Evidence-Based Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China.
Fan-Long BuCentre for Evidence-Based Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China.
Fei DongCentre for Evidence-Based Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China.
Jian-Hua WangScience and Technology Department, Liaoning University of Traditional Chinese Medicine, Shenyang, China.
Si-Jia ZhuCentre for Evidence-Based Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China.
Xiao-Wen ZhangCentre for Evidence-Based Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China.
Nicola RobinsonCentre for Evidence-Based Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China.
Jian-Ping LiuCentre for Evidence-Based Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

introductionThe contribution made by e-cigarettes to smoking cessation continues to be controversial. Reports suggest that teenagers are becoming increasingly addicted to e-cigarettes and that e-cigarette use in adolescents is associated with subsequent cigarette smoking.

methodsSystematic searches of eleven databases were conducted (January 2015 to June 2020). Systematic reviews, randomized controlled trials (RCTs) and cohort studies comparing e-cigarettes with placebo e-cigarettes, nicotine replacement therapy (NRT) or no e-cigarette use were included. The two primary outcomes were smoking cessation among smokers and smoking initiation among non-smoking teenagers. The secondary outcome was adverse events. Data were synthesized using risk ratio (RR) or adjusted odds ratio (AOR) with 95% confidence interval (CI).

resultsSix systematic reviews, 5 RCTs and 24 cohort studies were identified. For smoking cessation, findings from 4 systematic reviews indicated that e-cigarettes contributed to cessation while one found the opposite. Meta-analysis of 5 RCTs suggested that e-cigarettes were superior to NRT or placebo for smoking cessation (RR=1.55; 95% CI: 1.00-2.40; I

conclusionsLow certainty evidence suggests that e-cigarettes appear to be potentially effective for smoking cessation. The use of e-cigarettes in adolescents may be associated with smoking initiation. No serious adverse events were reported.

Indexed as

e-cigarettesrapid reviewsmoking cessationsmoking initiationsystematic review

Identifiers

PMID33456434
PMCPMC7805085

What OpenQuestion holds

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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.