“More often that not, it’s just the thought of them that calms my nerves. I once told a claustrophobic patient to carry a single Xanax in her purse every time she boards a plane, its mere presence strong enough to elicit a mental reaction, a physical response. She probably wouldn’t even need to take it, I told her; just knowing there was an escape within reach would be enough to ease the suffocating weight from her chest.”