If requested by Mexican authorities, you will need to provide your passport and stamp to prove your entrance and stay, copies and photos are not accepted. To demonstrate your visa status, you can get a digital registry of your entry documents from the Portal de Servicios INM.
It is illegal to bring electronic cigarettes, vaping devices, and solutions into Mexico or to buy and sell them. If found in your belongings by customs officials, these will be confiscated; resulting in being fined or being detained.
You can be fined up to 180 USD for smoking or vaping in public places.
Do not become involved with drugs of any kind. Penalties for drug offenses are severe and convictions carry sentences of up to 25 years.