NEED ANSWER PLZ HELP I HAVE A PROBLEM?

Okay so i know a lot of kids who do pot, and they all brag about being high and how good it feels, and i want to feel that. But there are way to many side effects that i dnt look forward to. But i herd of this stuff calld nitrous oxide (laughing gas) that givs u a similar mental and physical feeling for a couple minutes. I herd ther isnt many side effects, and its easy to get, but i dnt kno if these r true. What will it feel lik? Is it legal to take in the us? What harmful side effects r ther? Wher can i get it? Wat happens wen u tak it? Etc thanx :)