Occasional cigars or cigarettes do not cause hair loss. If you are concerned it is best to consult with your doctor. Smoking in general is not good for you and is not good for wound healing.
It is best to ask your surgeon about post operative care as each doctor has their unique regimen. If your don't get the results you expect or have issues, you can't blame the Internet if your surgeon wasn't included in the loop.
Minoxidil will not make your hair transplant result look any better. Minoxidil is not necessary after surgery. You can still use minoxidil to treat general thinning. Consult with your doctor.
