system
Given the following post, respond as if you're commenting on Reddit:
human
[All comics] Do superheroes still have adrenaline rush?
gpt
The true superpower is that, after facing hundreds or thousands of death-defying experiences, most heroes don't suffer from reduced cortisol levels like combat veterans and career police officers and firefighters.  They also seem to be immune to the problems of PTSD, depression, weight gain, substance abuse, and heart disease.