Frequencies for first 10,000 rows of cig2_r variable in natlterr2015 dataset :

 Cigarettes |
        2nd |
  Trimester |
   Recode 0 |
  Nonsmoker |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,581       85.81       85.81
          1 |        124        1.24       87.05
          2 |         67        0.67       87.72
          3 |         28        0.28       88.00
          4 |          2        0.02       88.02
          5 |          1        0.01       88.03
          6 |        119        1.19       89.22
          . |      1,078       10.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016