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Keyword clustering analysis of e-cigarette research.
| Cluster ID | Size | Silhouette | Mean (Year) | Top terms |
|---|---|---|---|---|
| #0 | 179 | 0.581 | 2017 | Oxidative stress |
| #1 | 149 | 0.564 | 2016 | High school student |
| #2 | 103 | 0.594 | 2014 | Smoking cessation |
| #3 | 66 | 0.7 | 2015 | Delivery |
| #4 | 24 | 0.805 | 2017 | Behavioral economics |
| #5 | 19 | 0.956 | 2012 | Heart disease |
| #6 | 17 | 0.936 | 2012 | Smoker |
| #7 | 15 | 0.927 | 2020 | Vitamin e acetate |
| #8 | 14 | 0.946 | 2017 | Oral commensal bacteria |
| #9 | 6 | 0.96 | 2018 | Tobacco policy |
| #10 | 4 | 0.995 | 2012 | Tobacco-related disease |
