> summary(gams.mod1)

Call:
glm(formula = illness ~ 1 + acet + gb + acet:gb, family = binomial("logit"), 
    weights = amscount)

Deviance Residuals: 
      1        2        3        4        5        6        7        8  
-8.0454   9.3391  -5.1253   7.7256  -8.3057   9.5436  -5.7703   8.3697  

Coefficients:
             Estimate Std. Error z value  Pr(>|z|)    
(Intercept) -0.680568   0.194057 -3.5070 0.0004531 ***
acet        -1.324765   0.344528 -3.8452 0.0001205 ***
gb           0.047319   0.270665  0.1748 0.8612163    
acet:gb      0.166255   0.468098  0.3552 0.7224615    
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 

(Dispersion parameter for binomial family taken to be 1)

    Null deviance: 532.378  on 7  degrees of freedom
Residual deviance: 501.318  on 4  degrees of freedom
AIC: 509.318

Number of Fisher Scoring iterations: 5

>