Sure,I've read a lot by Crowley and about him. He's one of those unique,boy's own type people that are virtually extinct in the 21st century,globalised world .
Try The John Symond's bio "The great beast". It's about the best biography out there.
P.S. He used until he died. In fact,there's a story that Crowley asked the doctor to give him a shot of dope whilst on his death bed.The doctor refused.So,Crowley put a curse on him and the doctor dies shortly after Crowley.