In this exercise, we examine the percentage of 8th-, 10th-, and 12th-grade students who reported smoking cigarettes daily in the past 30 days as reported by the Monitoring the Future survey. Data are reported in this time-series graph from 1980 to 2014. Describe the smoking trends for each group of students.

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100 50 40- 30 12th grade 20 10th grade 10 - 8th grade- 1980 1985 1990 1995 2000 2005 2010 2014 Percent