DSII ADS Question

Ok this little problem came up at the weekend.

Put simply can an ADS target missiles through smoke?

The situation was this:
I wanted to fire 2 GMS/L's at an ADS vehicle but it was behind smoke (in
this case smoke from burning vehicles).
Now the rules say that this kind of smoke stops GMS fire. So I decide to
shoot at another target that is in front of the 
smoke instead. The ADS Vehicle then proceeds to shot down both missiles.

Now I know the weapon the ADS uses is like a RFAC but my arguement was,
if my missile targetting system cannot 
operate through smoke then why should the ADS's missile tracking ability
be able to.
The compromise in the end was to reduce the ADS by one die type. (which
still got both missiles!)

Any thoughts on this one?

Jeremey  
jeremy.claridge@kcl.ac.uk