By Veronika Bondarenko The nitrogen drink craze shows no sign of dying down. Nitrogen: this is the chemical that makes your drink foamier and, often, sweeter. It is also the stuff that makes those dramatic cocktails that emerge out of a cloud of smoke when the waiter places it in front of you at a fancy bar. It has also been used in beer and coffee (more on that later) to make the drink both smoother and sweeter without adding sugar. Nitrogen, often shortened to “nitro,” when used in the name of a beverage gives your drink a sort of silky, smooth mouthfeel while making it seem richer than it a…