I need the real 4-1-1 on you guessed it: CIGARS! Does an occasional cigar (1 per week) cause hair loss?

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.

Nicotine in any form causes the small blood vessels in the skin to contract shrink and shrink down.  This can impede healing and take of grafts.  Smoking can also cause a myriad of other problems that have been well publicized.  That said, a cigar once a week should have little adverse effect on your hair transplant.  Ideally you abstain for two weeks before and after surgery.

I don't think so that one cigar a week will produce you hair loss. But it is very well documented about impaired microcirculation (scalp or other body areas) of those moderate and heavy daily smokers that have plastic or hair restoration surgery. Obviously smoking can cause cancer.