The Commission must not accept liability for:
(a) an injury sustained, or a disease contracted, by a person, or the death of a person; or
(b) an injury or a disease that has been aggravated, or materially contributed to; or
(c) an injury or disease, a sign or symptom of which has been aggravated, or materially contributed to;
if the injury, disease, death, aggravation or material contribution is related to defence service only because of the person's use of tobacco products.