I think people with bi-polar disorders and depression get hooked on it the easiest. I can't speak for dudes because I never ran with the cocaine crowds. It makes sense in Hollywood where money is no object and they have time to kill between movies...or having an agent call them... They likely do drugs out of boredom and perhaps the same bi-polar type feelings of being on top of the world one minute and being replaced by the next younger star when a new movie comes out.
In my life, I've seen, attractive females with such mental health issues tend to be the easiest targets from guys trying to get them addicted for manipulation. I don't know a lot of drug users, per se...but the two people I know that did cocaine in their late teens/early 20s were both super-good-looking females that got the stuff from their boyfriends. They both had those kinds of issues and one struggled with anorexia, particularly after she got off the stuff. My guess is, they weren't couples BEFORE they did the drugs together, and the drugs were used as a carrot to keep the girls coming back.
One of them is in her late 30s now, not a current user...makes a 6 figure income working in the medical field...but I think she has deviated septum issues. The other one, I have no idea where she landed but I think she was an art major...she's probably homeless or working at a Starbucks somewhere.