Frequencies for first 10,000 rows of cig2_r variable in natl2016 dataset :

 Cigarettes |
        2nd |
  Trimester |
   Recode 0 |
  Nonsmoker |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,837       88.37       88.37
          1 |        460        4.60       92.97
          2 |        323        3.23       96.20
          3 |         87        0.87       97.07
          4 |         13        0.13       97.20
          5 |          4        0.04       97.24
          6 |        276        2.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Oct 2017