Can nicotine gum or patches cause hair loss? ( male 26 yo)

No firm evidence: There are folk who claim this with stories of constriction of blood vessels, etc. But there is no solid research findings and with all of the interest in fighting this hated habit - you have to know that there would be great big published articles everywhere. It would work too! so, no I do not think nicotine causes hair loss. But there are other good reasons to quit nicotine anyway. Good luck!