After 14 years of being on Hydroxychloroquine/Mepacrine, I arrived at a new Dermatologists Clinic only to be told that ''they don't work if you are a smoker!''. What a waste of tablets for over a decade! He now wants to put me on Dapsone - but has warned it could make me very ill! Has anyone had any negative experiences with Dapsone please. He said the other options are more likely to make me vulnerable to cancer. I think I need to see a Vet sharpish!