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Clinical characteristics of the study completers.
| Age | 42.3 ± 13.5 years |
| Gender | |
| Male | 14 |
| Female | 21 |
| Ethnicity | |
| White | 26 |
| African Amer. | 4 |
| Hispanic | 1 |
| Other | 3 |
| Consumption at intake | |
| Lifetime | 16.3 |
| Past month | 11.3 cigarettes/day |
| rs16969968 genotype | |
| GG | 24 |
| AG | 15 |
| AA | 5 |
| FTND score | 3.7 ± 2.5 |
