Answer first
Smoking has been linked in studies with earlier and more severe hair thinning, likely through reduced blood flow, oxidative stress and damage to follicles; vaping also delivers nicotine, which narrows blood vessels. Cutting down or quitting is one of the most useful things you can do for your skin, scalp and overall health.
What the research suggests
Observational studies link smoking with more advanced male pattern hair loss; they show association, not proof of cause in every person.
Vaping
Long-term data is limited, but nicotine still affects blood vessels.
Getting help
Talk to your doctor or a quit-smoking service; it's never too late to benefit.
Questions
Will quitting regrow my hair?
It won't reverse pattern loss on its own, but it removes one factor working against you.
Is second-hand smoke a concern?
Smoke-free homes are better for everyone's health.