NO, NO AND I MEAN NO!
Headshops will have crackers, balloons, and the chargers.All commonly referred to as whip-its.
But, you do not inhale the nitrous directly from the cracker.If you're going to do anything like this, atleast do it right! You put the ballo0n over the cracker and let the gas fill the balloon, take the balloon off and inhale from there. Why? Have you even broken open a cartridge with a nail? (co2 or nitrous?).There are EXTREME amounts of pressure, and not to mention the fact how cold nitrous is.You can **** your lungs up taking hits out of the cartridge.
Also, it's not "that" safe.Yeah. it's probably the safest amoungst the inhalants.But still. . . . .