current status of marijuana in Zihua ?

Happened to a friend of mine a couple of months ago. Jailed overnight and fined. I cannot vouch for the content in this link but https://www.mexicanist.com/l/heres-why-cannabis-still-isnt-legal-in-mexico/#:~:text=Mexico%27s%20most%20recent%20change%20in,a%20prescription%20and...

This from Wikipedia is probably the best answer.

On June 28, 2021, the Supreme Court voted 8–3 to legalize adult use marijuana under Mexican law. However, state and federal penal laws remain in place, pending action by the Mexican Congress to clean up inconsistencies and remove penal language. No legal structure has been put into place allowing for legal sale of marijuana, nor are there provisions for commercial growth and production. Meanwhile, those incarcerated for sale or possession have no path to release. All these await legislative action to bring Mexico's laws into alignment with the Supreme Court rulings. Unlike in the US, a Supreme Court ruling does not automatically invalidate all existing laws. Congress has had years to act, but has not yet done so successfully.

Of course smoking in public places is prohibited in Mexico ???????? as it is in most places in Canada so smoking on a street corner or in an alley in both countries gives the pohlease cause to check you out.