What you had at your dentist's office was _not_ N2O alone. What you had was N2O/O2 with a minimum 30% O2 (assuming this was a fail-safe machine). For you to equate this with nitrogen narcosis, &/or suggest trying to build up a tolerance in this manner, is dead wrong, and if you breathe pure N2O for a few minutes, you will be dead as well as wrong! I echo the thoughts/comments of Robt. M Barbarite, only I am not kidding. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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