11. No benefit is payable under this Order to or in respect of a person by reason of—
(a)an injury which is predominantly caused or predominantly made worse by, or death which is predominantly caused by—
(i)the use or effect of tobacco,
(ii)the consumption of alcohol,
(iii)medical treatment of the injury except where the treatment is provided while the person sustaining the injury is on military operations outside the United Kingdom and in circumstances relating to service where medical facilities are limited,
(iv)the non-therapeutic use of drugs,
(v)consensual sexual activities,
(vi)except where article 8 applies, events, experiences, exposures and activities occurring before the member of the forces entered service;
(b)an illness which is—
(i)caused by a single gene defect or is predominantly hereditary in origin;
(ii)a personality disorder;
(iii)an endogenous infection;
(iv)an exogenous infection except where the infection is endemic to a tropical or a subtropical region and the person infected has been exposed to the infection in the course of his service or where, in a temperate region, there has been an outbreak of the infection in service accommodation or a workplace.
(c)a self-inflicted injury whether or not causing death except where the self-inflicting of injury is a result of a mental illness caused by service.