Should tea and coffee be avoided after FUE and if so for how long, and when can resume smoking?

It is best to contact your doctor about post operative care and instructions since each doctor has a different regimen.There is no issue with tea or coffee.

Coffee and tea are not an issue.  Nicotine and smoking are detrimental in many ways and should be avoided in general. 

Any vasoconstrictive effects are very minor and there will be no effect on your surgery. I cannot give any advice on when to resume smoking, as you shouldn't. If you've given up smoking for the procedure then now is the best time to quit completely. 

Hi. I don't usually ask patients to refrain from Coffee after hair transplants. Smoking, on the other hand, has a huge impact on circulation and healing. I suggest stopping cigarettes a few days before and staying off as long as possible after, at least 5 or 6 days.
Dr. Robert Jones

Tea and coffee are fine to take and will not impact recipient site growh or donor area healing. Enjoy your tea or coffee