I tend to think that LeBron is on HGH for many of the reasons already discussed. The only thing I'll say as a caveat to it all is that in the NBA it is particularly hard to tell since a very high percent of the league is abnormally tall and probably does have some sort of odd growth/hormonal imbalance (as opposed to baseball, where players tend to be closer to average height).
That said, the NBA has always had tall players, and none of them had jaws and skulls like LeBron.
It seems weird that we are all willing to chalk everything up with Lebron to him being a physical freak. Consider the following things
1) He is already 42nd all time in minutes played (right ahead of Kevin Willis who played into his 40's and Steve Nash who was pretty healthy until his final age 40 or 41 season) He has never had a single serious injury in his career
2) He had to have a weird and vague procedure to remove a growth from his jaw
3) He has obviously gone bald at a very young age
4) He has probably put on about 40 pounds of mass since entering the league (look at the pics in this thread)
5) The rapid weight loss he did as a ketogenic diet. I don't want to get off track but I am on a keto diet right now and you don't lose that much muscle mass in 67 days (
http://cdn2-b.examiner.com/sites/default/files/styles/article_large/hash/dd/8a/dd8a9e3c230b18c9a933fa55ebac43ff.jpg?itok=GGUmaEe3)
Any one of these by themselves, particularly the baldness, could be totally normal stuff. However, you put those 5 together and it becomes pretty naive to think there isn't a very high chance he has used either anabolic steroids or hgh throughout his career.