Well I did the search and here's all I could really find..
from growafrohairlong.com:
Question: My hair breaks off every time it grows and inch. What could this be?
Answer: Your hair may not have enough moisture in the strands. You may need to deep condition your hair weekly. There could be excessive stress in our life. Stress dries out your hair and skin. Also there may be chemistry changes in your body, Other factors are: birth control pills, immune dificiency, change in medication, heavy medications, lack of important vitamin and minerals, poor food diet, <b>excessive coffee drinking</b>, excessive alcohol drinking, cigarette smoking, rough combing, using products that strip natural oils from your hair, Not shampooing your hair on a regular routine, Chlorine from the swimming pool, Certain no-lye relaxers, bleaching and dyeing the hair frequently, applying a relaxer over an older relaxer instead of just the new growth. Leaving a relaxer on your hair too long.
that was through about 135 results, but if i find something else i'll post it.