WAIT, you want to lace your weed with a gas? Like...how do you plan to make the gas STAY?
Hmmmm...maybe it would work if you got liquid nitrous oxide and put it in your bong like the water, and then when you hit the bowl you'd inhale your smoke AND the laughing gas! But I'm reading something about liquid mixtures causing shock sensitive explosions...I dunno
The closest way of doing this would be hitting your weed and the nitrous at the same time but it wouldn't even make a difference just smoke than take some nitrous hits.
ummmmm put ur buds in a air sealed container and fill with ur laughing gas..... and hope the bud absorbs the gas, but question why the hell do you wona ruin u weed....... have fun by all means but hope ur not sellin your shit haha