my hairdresser friend says that most people produce around the same amount of oil. however, unlike thick hair, fine hair is highly prone to being "greasy", simply because the oil can't be adequately absorbed...she says it's like comparing a rag mop with sparse fibers to one with dense fibers...the sparse one will start dripping upon mopping up very little liquid -- whereas, the dense one can absorb several times the amount, with no dripping.
she also said that although fine hair is also highly prone to damage from bleaching, if done correctly, the damage will be minimal, and that the minimal damage is actually beneficial -- because the extreme dryness that bleaching causes helps to improve the ability for fine hair to adequately absorb oil.
about 7 years ago, i put her claims to the test with my super fine hair, and holy carp, she was right...i went from having to wash my hair twice a day, to being able to go 3-4 days between washes, without any greasy look or feel...
ever since i started
vaping, however (it's been almost 2yrs now), i noticed that i can now only go 1-2 days between washes. but still, it's a whole lot better than twice a day!