I don't think nitrious oxide is a solvent, though i don't know exactly what classifies a solvent. It's relativly safe and dentists use the same gass to anesthesize children.
Just don't do too much, out of body experiances have a good risk of a bad trip. Also inhaling it from a canister can shoot the gass at you quite fast and hurt your lungs. Some are pressurised cans so always expel it into a baloon then inhale from the balloon.
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