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1990

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4. Have you ever made a serious attempt to stop smoking cigarettes?

1[] Yes
2[] No (6)
9[] DK (6)

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1980

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8a. Have you ever made a serious attempt to stop smoking cigarettes?

1[] Y
2[] N (NP)

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1979

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8a. Have you ever made a serious attempt to stop smoking cigarettes?

1[] Y
2[] N (NP)

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1978

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8a. Have you ever made a serious attempt to stop smoking cigarettes?

1[] Y
2[] N (NP)

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