As well as steroid use. Most of them have been bodybuilders (to varying degrees) in the past and they will usually dabble in steroid usage. Even the mildest forms of steroids can crack a female's voice for life
i'm still scratching my head as to how you have so much knowledge but you seem to be real stubborn with indexing your experiences via reviews...it would help so many out with who to avoid , who to see etc etc
unless there is another reason you wont?