I took 6 mg of nicotine chewing gum nicotex 2 days after hair transplantation surgery

It is best to ask your surgeon about post operative care as each doctor has their unique regimen.  

Thank you for your question. Smoking can jeopardize the recovery. I suggest that you review the recovery instructions with your board certified facial plastic surgeon.
Best wishes,

Taking nixotine and smoking a few cigarettes will not impact the growth of your new grafts. Better orr no smoking, of course