Multiple Chemical Sensitivity appears to be a psychogenic illness. https://en.m.wikipedia.org/wiki/Multiple_chemical_sensitivity https://en.m.wikipedia.org/wik

Multiple Chemical Sensitivity appears to be a psychogenic illness. https://en.m.wikipedia.org/wiki/Multiple_chemical_sensitivity https://en.m.wikipedia.org/wiki/Multiple_chemical_sensitivit... This is not to say the symptoms are not real and debilitating, but it would be difficult to provide housing which is suitable if the symptoms are not actually correlated with specific chemicals in the environment.