Recreational use of weed is legal federally here in Mexico. Mexico's Supreme Court, in May/22, has stated in its majority opinion that restricting "how much" to any amount for personal use is unconstitutional, and if the crown wants to allege trafficking, it has the onus of proving that the amount is not for personal use. However, we recommend that foreigners should NOT smoke it while visiting Oaxaca, simply because the police might very well threaten to arrest you and require that you pay a fine (bribe?).

However, we now do accommodate cannabis aficionados (potheads for you older agave distillate drinkers) by taking clients to a couple of palenques which infuse and/or distill their mezcal with marijuana; for sampling, and for buying if so inclined. And we can bring along for a taste during the course of the day, our own stash of mezcal with different cannabis expressions, including distilled with weed and fruit. But if this interests you, ask us well in advance so we can make plans with our palenquero friends to accommodate that passion. 

If you haven't already, have a peak at this article written by Alvin back in 2017:

https://www.oaxacamezcaltours.com/mezcalarticles/marijuana-and-mezcal-in-oaxaca-mexico-pleasant-bedfellows