PED use is rife in the crossfit community, especially when you start reaching competition level. It is a high intensity sport that requires and places emphasis on recovery time. The exact use-case for PEDs.
PED use strains your heart. Crossfit by design is high intensity.
I wouldn't be surprised if there are tons of crossfitters running around with hand grenades for hearts.
EDIT:
This study found that 33% of surveyed professional crossfitters self-reported anabolic use. The number was 74% for men in the 30-39 age bracket, with the older, more experienced competitors the most likely to be on the juice.