What are medicinal salts? Epsom? Something else?

I was sitting in a Chinese restaurant on Mott St in Chinatown, lower Manhattan (Brooklyn Jay you were in the area at a similar time - it was 1 Mott St at the Bowery, a very nice place). Smoking was allowed but the woman at the table behind me lit her cigarette then propped her elbow on the arm of the chair with her hand tipped back, just inches from my face. I backed my chair into her and asked her to keep the cancer stick out of my face. So many smokers felt so entitled to pollute everyone's air. (There are many other smokers in restaurants stories, they can be saved for later.)

When I visit NYC now I eat at Wo Hop in the downstairs restaurant. The fancy upstairs place is for tourists.