Linear regression                                      Number of obs =    1044
                                                       F(  7,  1036) =    9.87
                                                       Prob > F      =  0.0000
                                                       R-squared     =  0.0605
                                                       Root MSE      =  5.4527

------------------------------------------------------------------------------
             |               Robust
       smoke |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
      gender |  -2.354023   .9800531    -2.40   0.016    -4.277139   -.4309078
         age |   .0949464   .0390511     2.43   0.015     .0183181    .1715746
    religion |  -.9405706   .5638188    -1.67   0.096    -2.046928    .1657865
      health |   .3188747   .2684913     1.19   0.235    -.2079741    .8457235
    exercise |  -.2209486   .0596876    -3.70   0.000    -.3380709   -.1038262
     alchole |   .1767968   .0351802     5.03   0.000     .1077642    .2458294
      stress |   .5037958   .2826936     1.78   0.075    -.0509216    1.058513
       _cons |   7.513579   1.790126     4.20   0.000     4.000892    11.02627
------------------------------------------------------------------------------