I just wonder, was he a regular smoker or not? As far as i know, after his death a few boxes of cigarettes were found in his wardrobe, but if MJ smoked often he would lose his high toned voice, right (or he could bring real damage to his vocal cords)? Also, i noticed that startng from invincible era till his death, MJ voice become a little bit more rough.... Maybe it was be an consequence of him, smoking cigarettes....