I have been saving my hair for 7 years now and are finally going to sell it. It is thick and has never been dyed or bleached, and is pretty smooth, shiny and healthy. My hair has thin all natural stripes which can be seen in some lights. It is pretty straight, but gets small waves after being washed.
I have never blow dried, straightened or curled my hair and usually I wear it in a braid. I also use good hair products that doesn't contain alcohol. I try not to wash my hair that often, to keep my natural hair-oils. I have never smoked.