I have nothing against marijuana. Whatever, but I hope my children won't waste their time with it, because at it's best that's what weed is.
Time you enjoy wasting is not time wasted, said Lennon. Sure, if you just lie down on a couch and flip channels all night long, you could be as well dead, but weed (along of other substances) also offers huge creativity boost, to levels that cannot be reached in any other way. It's not a coincidence that world's most acclaimed artists, musicians, poets and writers were drug users (and abusers). Moderation is the key to everything, as water will kill you in excess.
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Kudos to the OP, screw alcohol.