Is the effect of laughing gas like being drunk?

Not quite...: The nitrous oxide has a way of disassociating you with the enviroment, warps your sense of time, and delays your reaction to any stimulus. But you remain coherent.. You can respond when being spoken to, and you can understand what is going on around you, you just don't care. If you're really drunk, you may be incoherent. There's a fine line of similarity. N2o is instantly reversible, alcohol no.