If your goal is to avoid all suspicion of harmful chemicals, than using traditional deodorant or antiperspirant will make that very difficult. The easiest way to keep your body safe and healthy is to avoid entirely all chemical laden deodorants and antiperspirants, and begin using natural deodorants.
Medical Definition of nitro. : containing or being the monovalent group NO2 united through nitrogen.
Nitric Oxide (NO) is NOT the same as Nitrous Oxide (N2O). Nitric Oxide is one molecule of nitrogen, one of oxygen. Nitrous Oxide has 2 molecules of nitrogen, and one of oxygen. And that extra molecule of nitrogen changes the gas completely. Nitrous Oxide (N2O) has been getting some press recently, since Demi Moore was hospitalized for inhaling canned Nitrous Oxide (in a form called whippets) and having a seizure. Nitrous oxide is used in aerosol cans, to propel whipped cream or cooking spray out of the bottle.