That’s actually something I’ve been curious about too. Even if herbal cigarettes are tobacco-free, the act of inhaling smoke itself can still be irritating and potentially trigger attacks for some people. Cluster headaches are often sensitive to strong smells, smoke, and changes in oxygen levels, so it wouldn’t surprise me if they could exacerbate symptoms. From what I’ve read and heard in similar discussions, many people with cluster headaches tend to avoid any type of smoke altogether, just to be on the safe side.
