One of the number one environmental pollution is self induced
and that would be smoking.
Whether you’re doing pipe or any kind of tobacco,
having smoke near your beard in particular
and in your hair can give an undertone of yellow.
You can actually see that a lot on guys who smoke a pipe
or who smoke cigarettes or cigar.
Their mustache and their soul patch will be yellow in particular.
So it’s all that smoke and all that pollution is around your face
and it attaches to your hair.