That's weird, the reason I have breakage is not listed..
It's not blowdrying neither Flat Ironing (i've never use heat)
It's not hair coloring (i luv to much my jet black hair color)
it's not puff, i use a satin ribbon for doing my puff and I don't to a tight puff.
and I don't comb my hair...
I have fine hair, so I have to hide it, the brutal cold weather weakens it, the hard water breaks it etc etc,
so I don't know if I can say "Environment"
when I started my HHJ, I haven't retained length for a year, only breakage.
Now that I collect some knowledge, I know how to deal with it, find a great protective style (an afro wig) and how to deal with hard water,(hard filter + acidic rinse) and which treatments to do for strenghthens it. Now, step by step, progressively, I'm retaining length.