Something interesting I didn’t know about Princess Di: she fell in to the clutches of a New Age spiv, who ‘dignosed’ that she was suffering from lead contamination in her cheek. Di recalled breaking a lead pencil against her cheek at the age of 12! She was told that the residue of lead was having a detrimental effect on her health; and believed it.
One small snag: ‘lead’ pencils are made with graphite and a binder of clay or some suitable substitute. No lead.