| Identifying Health-Related Topics on Twitter - An Exploration of Tobacco-Related Tweets as a Test Topic Recent countries visiting this post |  |
 | 8 | United States |
 | 2 | |
 | 1 | Italy |
 | 1 | China |
 | 1 | Russian Federation |
| Identifying Health-Related Topics on Twitter - An Exploration of Tobacco-Related Tweets as a Test Topic Recent countries visiting this post | |
| 8 | United States |
| 2 | |
| 1 | Italy |
| 1 | China |
| 1 | Russian Federation |