Alcohol and smoking linked to early-onset colorectal cancer in observational studies
A review of observational studies linked alcohol use and smoking with early-onset colorectal cancer. The abstract leaves the age definition and comparison groups unspecified, and the associations do not establish causation.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The combined observational evidence linked both alcohol use and smoking with higher odds of colorectal cancer occurring at younger ages. The review also reported that higher alcohol intake was associated with higher cancer odds. These are associations: the abstract does not establish that either exposure caused the cancer cases or quantify an individual's chance of developing it.
The abstract does not define exposure reference groups, the age cutoff for early-onset cancer, follow-up periods or absolute cancer rates. These gaps limit interpretation of its pooled associations.
Smoking categories were combined
The smoking analysis grouped people who had ever smoked with those currently smoking. That combined category does not separate current use from past use, so the summary cannot identify how those groups differ.
Odds are a statistical scale
The reported estimates use odds ratios, which compare the odds of an outcome between groups. They are not percentage changes in risk, and the abstract provides no absolute rates to show how common early-onset cancer was.
The original publication
Associations of Alcohol Use and Smoking With Early-Onset Colorectal Cancer-A Systematic Review and Meta-Analysis.
Wieser J, Hoffmeister M, Brenner H et al.
Clin Colorectal Cancer · 2025
- PubMed ID
- 40544033
- Record checked
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