it is, tequila doesnt have worms
http://www.mezcal.com/worms.html
In 25 years we have never met a palenquero who has offered a sip of his mezcal with: a Worm, a Lime or Salt. In our experience the only use of the worm besides a marketing gimmick is to mask the chemical taste of poorly produced mezcal.
Mezcal is not technically tequila.. its not made from the BLUE AGAVE plant.. its like not all brandy is cognac.. not all mezcal is tequila
I like Sauza Tequila Reposado Hornitos or 1800 silver..
thats it otherwise its total crap.