I have seen much more family / personal strife come in the form of alcohol and other man made substances whether it be cocaine, prescription drugs or God only knows whatelse (Meth is rampant here)....I have never seen a 'pot head' starting chit, unless there was something else in the mix.
I personally do not mind Marajuana and do not believe that is a gateway, if you are going for the hard stuff you may try Marajuana but most hard core users I have seen skipped it.
I do not condone the use in front of kids but then again I do not necessarily agree with drinking in front of them either. I have never smoked it as I find the smell repulsive and almost nauseating but then I have never been much of a drinker or curious enough to try any other narcotic.
X2