For families weighing treatment for a young person, the review is a useful map of which messages actually register.
Researchers at Ohio State University and the Hebrew University of Jerusalem synthesized 29 studies covering 201 distinct warning messages. The review was published in BMC Public Health in April 2026.
What the Review Covered
The team searched the medical literature for studies that tested how people respond to e-cigarette warnings on packaging or as standalone messages, covering research published from 2014 through mid-2025.
Of 261 candidate articles, 29 met the criteria. Nine focused on youth, with participants aged 11 to 18, and the remainder on adults.
The 201 warnings sorted into eight themes. Health risks was the largest at 58 messages, followed by toxicity or chemicals at 42, harm reduction at 38, and addiction and nicotine at 30. Smaller clusters covered brain development, cessation, and even litter.
Two numbers stand out. Only 15 of the 201 warnings, about 7.5 percent, used wording aimed at young people. Exactly one was written specifically for adults. Roughly 42 percent used hedging language such as may or could.
Why Harm Reduction Wording Cuts Both Ways
Harm reduction messages are the relative-risk statements, the ones saying a product carries lower risk of tobacco-related disease than conventional cigarettes.
Across experimental studies, these frequently increased the perception that e-cigarettes are less harmful and increased purchase or switching intentions, particularly among adults who smoke and particularly when framed around switching completely.
Among young people the same wording worked against prevention. Reviewers found harm reduction messages lowered perceived harm and, in some subgroups, increased openness to trying e-cigarettes.
The evidence was not uniform. One study of 715 high school students found relative-risk statements actually increased skepticism and reduced intentions to use. But the overall pattern was clear enough that the authors judged the theme poorly suited to youth audiences.
That is the tension the review is built around. A message calibrated to move an adult smoker off cigarettes is the same message a teenager may read as reassurance.
What Landed With Teenagers
Warnings describing concrete, immediate harms consistently outperformed everything else with young people. Brain development, lung damage, and chemical exposure produced stronger perceived harm, more emotional engagement, and reduced interest in using e-cigarettes.
Vague wording backfired. Youth read hedged phrasing as a signal that nobody really knows, which reduced both the perceived risk and the credibility of the warning itself. Teenage boys were more likely than girls to argue with warnings or tune them out.
Where Nicotine Addiction Warnings Fall Short
For young people, addiction-focused messages were repeatedly described as familiar and unsurprising rather than alarming.
The reviewers concluded such warnings are insufficient on their own to deter someone from starting, particularly for a generation already saturated in nicotine messaging.
Among adults the picture was different but not much better. Nicotine addiction warnings were rated clear, believable, and less ambiguous than the alternatives.
They simply did not move behavior much, functioning as a baseline informational cue rather than a prompt to quit.
Notably, addiction warnings and longer detailed warnings did reduce product appeal in experiments simulating real purchasing decisions, so the message is not inert. It is just not persuasive on its own.
What the Review Cannot Tell Us
This is a scoping review, not a meta-analysis, so it maps findings rather than pooling them into an effect size. The team searched only one database, which they acknowledge risks missing relevant work.
Studies of warnings on advertisements were excluded, as were studies that tested the federal nicotine warning by itself, so this is not an evaluation of the FDA label in isolation.
The deeper gap is that almost no study examined both audiences at once. Researchers tested youth prevention or adult harm reduction, rarely the trade-off between them, which is precisely the question regulators face.
What This Means for Treatment Seekers
Nicotine dependence is a substance use disorder, and the practical lesson here is that no label is a treatment plan. If you are a parent, the review suggests conversations about specific physical consequences will land better with a teenager than warnings about addiction, which they have heard and discounted.
Avoid framing vaping as the safer option, since that framing reliably lowers perceived risk in exactly the age group you are trying to protect.
If you are an adult who smokes and vapes, dual use tends to mean more total nicotine, not less, and the evidence that warnings alone will shift that is weak. Structured support does more.
Exploring Treatment Options
Concrete next steps for anyone reconsidering nicotine use:
- Ask a provider about nicotine replacement therapy and prescription cessation medications
- Check insurance coverage, since tobacco cessation counseling and medication are covered benefits under many plans
- For an adolescent or young adult, look for programs experienced with that age group rather than general adult tracks
- Ask whether a program treats nicotine dependence directly rather than as an afterthought to another substance
Rehab.com’s directory includes verified treatment centers with nicotine and tobacco cessation programs. Call
800-985-8516
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to speak with a treatment advisor about options.
