Mezcal –VS– Tequila
Few understand the difference between tequila and mezcal, and many don’t even know there is a difference. While traditionally, all tequilas were known as a type of mezcal. Today, they are distinct products, differentiated by the production process and taste, much the same way rye whisky differs from Scotch whiskey. Most mezcal is made today in the state of Oaxaca, although some is also made in Guerrero and other states. Tequila comes from the northwestern state of Jalisco (and a few nearby areas). They both derive from varieties of the Agave plant, known to the natives as mexcalmetl. Tequila is made from only agave tequilana Weber, blue variety. Mezcal, on the other hand, can be made from five different varieties of agave. Tequila is double distilled and a few brands even boast triple distillation. Mezcal is often only distilled once.
To make mezcal, the sugar-rich heart of the agave called the piña, is baked in a rock-lined pit oven over charcoal, and covered with layers of palm-fiber mats and earth, giving mezcal a strong, smoky flavor. Tequila piñas are baked or steamed in aboveground ovens or autoclaves.
Tequila and mezcal share a similar amount of alcohol in the bottle (around 38-40%), although mezcals tend to be a little stronger. Because mezcal feels a little more like lava as it flows down the back of your throat it is not quite as popular. This is evident in the number of brands of each type of drink. Currently there are over 500 different brands of tequila while the manlier mezcal boasts only 100 brands.
IIRC, it must be at least double distilled since it's toxic after just a single distillation. And, yes, Mexico is extremely aggressive when it comes to protecting the Tequila trademark. Next to oil, it's Mexico's most lucrative export. The invention of the Margarita has pumped billions of dollars into the Mexican economy over the years.