吸烟率和肺癌病率, 相关吗?

(年份) (吸烟率%) (15年后肺癌率*) (20年后肺癌率)
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1965 42.4 1980/60.7 1985/64.6
1970 37.4 1985/64.6 1990/68.0
1974 37.1 1989/67.5 1994/67.1
1978 34.1 1993/67.8 1998/67.5
1983 32.1 1998/67.5 2003/64.1
1985 30.1 2000/64.0 2005/61.0
1990 25.5 2005/61.0 2010/????
1995 24.7 2010/???? 2015/????
1999 23.5 2014/???? 2119/????
2003 21.6 2018/???? 2023/????
2007 19.8 2022/???? 2027/????
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Source: US population smoking rate is from CDC website; LC incidence data (cancer number per 100,000 people) are downloaded from NCI-SEER database.

* 为何用15年后肺癌率? -- 一般从基因突变渐进到临床癌症需要10-20年

有统计和流行病学的同学帮助分析吗?