1)girth gains more than 0.3" in 6months and i am a smoker
2)girth gains less than 0.3" in 6 months and i am a smoker
3)girth gains more than 0.3" in 6 months and i am not a smoker
4)girth gains less than 0.3" in 6 months and i am a smoker
5)no girth gains in 6 months and i am a smoker
6)no girth gains in 6 months and i am not a smoker
2)girth gains less than 0.3" in 6 months and i am a smoker
3)girth gains more than 0.3" in 6 months and i am not a smoker
4)girth gains less than 0.3" in 6 months and i am a smoker
5)no girth gains in 6 months and i am a smoker
6)no girth gains in 6 months and i am not a smoker