Snus does cause cancer. Snus is harmless. I hear both of these claims regularly, and in my view, both fall short. The truth lies somewhere in between — in what the research actually shows. Because when it comes to snus and cancer, there are studies with differing results, methodological limitations, and open questions. The body of evidence is more extensive than many people think, but also more contradictory.
Anyone who looks closely will not find a clear answer, but rather a nuanced picture. That is exactly what I am trying to break down here, without wanting to oversimplify or dramatize the topic.
Tobacco-containing snus and nicotine pouches are not the same thing
The term "snus" often refers to very different products. Are we talking about classic Swedish snus with tobacco? Or tobacco-free nicotine pouches? The distinction matters, because depending on the product, the ingredients — and therefore the potential cancer risk — vary considerably.
Classic Swedish snus contains tobacco and therefore tobacco-specific nitrosamines (TSNAs), which are classified as carcinogenic. Due to strict production standards, TSNA levels in Swedish snus are significantly lower than in many other tobacco products worldwide, but they are not zero.
Tobacco-free nicotine pouches, on the other hand, contain no tobacco — only nicotine along with carrier and flavoring substances. This makes a difference when assessing risk, even though long-term data are still largely lacking here.
What studies have shown so far
The most comprehensive analysis to date comes from Valen et al. from 2023, published in the International Journal of Cancer. Fifteen studies were evaluated, almost exclusively from Sweden, on cancer risks in various organs: the oral cavity, esophagus, stomach, pancreas, intestine, lungs, lymphatic system, and others. The results are not uniform.
Important: The body of evidence on snus and cancer is nuanced. Individual risks are being studied, but not every claim is clearly supported by science.
For the esophagus, rectum, and pancreas, some studies report indications of an elevated risk from the consumption of tobacco-containing snus. For lung cancer and stomach cancer, however, most analyses show no clear associations. The review itself explicitly rates the confidence in its own estimates as moderate to very low, primarily due to methodological limitations in the primary studies.
Oral cancer: What the data show
Snus and oral cancer is the topic most frequently discussed. The body of evidence is particularly interesting because more recent large studies deviate from what older individual studies had suggested.
A pooled analysis from nine Swedish cohort studies with over 418,000 male participants, published in the journal Tobacco Control, found no significant association between snus consumption and oral cancer. The hazard ratio was 0.90 — slightly below the level seen in non-users — but this was not statistically significant. No elevated risk was found among never-smokers either. A considerably older, smaller study from 2008 had described an increased incidence of oral cancer among daily snus users. The difference is partly explained by methodology, sample size, and the weaker control for confounders such as smoking status and alcohol consumption at the time.
An important distinction that often gets lost is also worth noting here: snus users frequently develop so-called "snuff dipper's lesions" — mucosal changes at the application site. These are not equivalent to cancer. Current data show no clearly elevated cancer probability from such lesions with Swedish snus, although changes in the oral cavity should generally be monitored. More on the effects of snus on the gums can be found in a separate article.
Pancreas and other investigated cancer types
Pancreatic cancer has received a particularly large amount of attention in snus research, because earlier studies produced notable findings. A prospective cohort study from Norway (Boffetta et al., 2005) found an elevated relative risk of pancreatic cancer among snus consumers. A study of Swedish construction workers from 2007 reached similar conclusions.
| Cancer type | Older studies | More recent / larger studies |
|---|---|---|
| Oral cancer | Individual indications of elevated risk | No significant association (pooled analysis, n=418,000) |
| Pancreatic cancer | Elevated risk in individual cohorts | No significant association (pooled analysis, n=424,000) |
| Rectal cancer | Limited data | Slightly elevated risk at high consumption in one study |
| Esophageal cancer | Contradictory | No clear association in current reviews |
| Lung cancer | No association | No association |
The early findings on the pancreas were substantially qualified by a pooled analysis from Araghi et al. from 2017, published in the International Journal of Cancer. Using data from 424,152 men across nine Swedish cohorts, the team found no significant association between snus consumption and pancreatic cancer risk after adjusting for smoking status. The authors concluded that combustion products in cigarette smoke are likely the decisive factor in cancer risk among smokers — not nicotine or nitrosamines alone.
How reliable is this research?
That is a question I consider central. Nearly all existing studies on snus and cancer are observational studies. They can show associations, but they cannot prove causality. People who consume more snus might also have different diets, drink more alcohol, or have a different lifestyle. This can never be fully controlled for in such studies.
In many early studies, smoking was inadequately accounted for as a confounder. Someone who uses snus while also smoking, or who smoked in the past, significantly distorts the results. More recent studies therefore deliberately restrict their analyses to never-smokers, which makes the estimates more reliable but also reduces sample sizes. In addition, exposure measurement in most studies is based on a single self-report at the start of the study. Whether someone is still consuming the same amount of snus ten or twenty years later remains unknown.
- Observational studies cannot prove causality — they only show statistical associations that may be explained by other factors.
- Confounding by smoking, alcohol, and lifestyle has often been inadequately corrected in older studies, limiting their informative value.
- More recent pooled analyses with very large sample sizes are methodologically more robust, but they too do not replace controlled long-term experiments.
- Cancers frequently only develop after decades, which means that short observation periods can systematically underestimate the risk.
What is currently being researched on nicotine pouches
For tobacco-containing Swedish snus, there is now a comparatively solid body of data, even if open questions remain. For tobacco-free nicotine pouches, the situation looks very different: these products in their modern form have only been on the market for a few years, and long-term data are simply not yet available.
A review with data up to January 2024, published in the journal Nicotine & Tobacco Research, evaluated 62 studies on tobacco-free nicotine pouches. The conclusion: their harmful substance content is lower than that of cigarettes and tobacco-containing snus. Some of the identified ingredients — including methyl eugenol and benzophenone — are classified by the International Agency for Research on Cancer as possibly carcinogenic. However, the amounts found were significantly lower than those in cigarettes or snus.
For context: the FDA (Food and Drug Administration) approved 20 ZYN products in 2024 following extensive review, because they present a lower cancer risk compared to cigarettes and tobacco-containing smokeless tobacco. Whether this will remain the case in the long term cannot be responsibly assessed without long-term data.
What can be said responsibly today
Based on current research, some statements can be made cleanly — others cannot. Snus is not equivalent to cigarette smoke: the carcinogenic effect of combustion products is very well established scientifically and is significantly greater than what has been shown for snus. But this does not mean that snus is risk-free.
Study note: Statements about snus and cancer must be supported by credible sources and explained in context. Contradictions between studies must not be omitted.
For tobacco-containing snus, there are indications of possible associations with certain types of cancer, particularly with very long-term and intensive consumption. These indications are not strong enough for a clear causal statement, but also not strong enough to ignore. What happens in the body during consumption is broken down in more detail in the guide on the effects of snus.
Summary: What research shows today
- Tobacco-containing snus contains nitrosamines with carcinogenic potential, but their levels are significantly lower than in cigarettes and many other tobacco products.
- Large pooled analyses from Sweden find no significant association between snus consumption and oral cancer or pancreatic cancer among never-smokers.
- Older individual studies partly produce contradictory findings, but are methodologically less robust than more recent pooled analyses with large sample sizes.
- According to research to date, tobacco-free nicotine pouches have a lower harmful substance profile than tobacco-containing snus, but reliable long-term data are still almost entirely lacking.
- None of the current research reports allows for a blanket statement: neither "snus causes cancer" nor "snus is safe" can be scientifically maintained.
