Frequencies for first 10,000 rows of cig2_r variable in natl2015 dataset :

 Cigarettes |
        2nd |
  Trimester |
   Recode 0 |
  Nonsmoker |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,593       85.93       85.93
          1 |        530        5.30       91.23
          2 |        356        3.56       94.79
          3 |         85        0.85       95.64
          4 |          9        0.09       95.73
          5 |          8        0.08       95.81
          6 |        419        4.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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