Well, Bruce... It all changed right after the success of Fist of Fury, and he began "self medicating", with the cannibis, and whatever else he began to take. The robustness he displayed when first arriving to HK to film TBB seeming disappeared over the next year and a half. I find it strange we didn't get more productivity out of him in that space of time, seeing how others; Jimmy Wang Yu, Sammo, Chang Yi, we're all so busy. I know he had only a two picture deal with Chow initially, however, he could have done-something! He basically did 4 films over two and a half years, whereas some stars did that many in a year and a half.
P.S. his head was looking extremely large for his body... Glad I'm not the only one who felt this way. He was a lil' dude, also.