I do not know the valid values of your continuous variables, but try something like this:
CLASS HARD_DRUGS INCOME2;
effectplot slicefit/ at(
AGE = 30
BMI = 25
MARI = 0
ALCOHOL = 1
CSMOKER = 1
HS = 1
ADHY2_ NHW = 0;
);
Whatever value you use on the right-hand side will determine the value at which the model is evaluated for the effectplot. The first continuous variable MODEL statement (AGG_MENT0 ) determines the continuous axis for the effect plot.