Harmful effects of nicotine.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing mechanistic, animal, and human literature without systematic quantitative pooling.
PubMed 25810571 · doi:10.4103/0971-5851.151771
What was done
The authors conducted a Medline and PubMed database search for animal and human studies examining the isolated biological and physiological effects of nicotine across various organ systems.
What was found
The abstract reports no quantitative data or effect sizes. It qualitatively describes nicotine as causing broad organ toxicity, including increased risks of cardiovascular, respiratory, and gastrointestinal disorders, impaired immune response, and adverse reproductive outcomes. It also notes mechanistic links to carcinogenesis and cancer progression, including oxidative stress, altered apoptosis, DNA mutations, increased tumor proliferation, metastasis, and resistance to chemoradiotherapy.
Why it matters
It synthesizes isolated nicotine toxicity data, arguing that nicotine itself—independent of whole tobacco smoke—carries significant multi-organ health risks and requires regulatory oversight.
Limits
The abstract describes a broad narrative literature search rather than a formal systematic review with pre-registered criteria or risk-of-bias assessments. No sample sizes, specific study designs, or quantitative risk estimates are provided. Findings aggregate animal models and mechanistic cell culture studies with human data without distinguishing their relative contributions.
Cited by
- supports Nicotine itself is not carcinogenic.