This is Dr. David
I am a cancer doctor.
I am glad the surgery did well and all of your lymph nodes were negative.
smoking pot can increase your risks for smoking related cancers in the future such as lung cancer and mouth cancer.
but those chances are small.
drinking wine and smoking can also increase your risks for oral cancer and throat cancers as well
but I would not be stressed about your esophageal cancer coming back because of smoking pot or 4 glasses of wine per week.
if you have bad anxiety symptoms, you may need to get more treatments for your anxiety symptoms.
regular exercise can help decrease anxiety and improve your health
eating healthy and eating more fruits and vegetables can help decrease your chances of future cancers as well
I suspect you are using the pot to help treat your anxiety symptoms.
let me know if you have questions.