| AIC | Akaike information criterion |
| BIC | Bayesian information criterion |
| CI | confidence interval |
| ENDS | electronic delivery systems |
| NRT | nicotine replacement therapy |
| PAH | polycyclic hydrocarbons |
| RRP | relative risk perceptions |
| SD | standard deviation |
| SLT | smokeless tobacco |
| TSNA | tobacco specific nitrosamines |
| US | United States |
| WHO | World Health Organization |
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