(b).

Age	Prevalence of tobacco usage (smoking or chewing)	95% CI	Prevalence of smoking	95% CI	Prevalence of chewing	95% CI	Prevalence of both chewing and smoking	95% CI
18–34	25.7%	22.6–28.8	16.5%	13.9–19.16	16.9%	14.3–19.6	7.7%	5.9–9.6
35–51	41.0%	37.8–45.7	31.6%	28.0–35.4	17.2%	14.2–20.3	7.1%	5.1–9.2
52–67	54.2%	49.0–59.4	47.4%	42.2–52.2	10.7%	7.5–13.9	3.8%	1.9–5.8
>68	55.9%	46.5–65.2	45.9%	35.5–55.3	14.4%	7.8–21.0	4.5%	0.6–8.4