im the worlds biggest killer ok a clue im very small

Demestos?

ha no good thinkin tho

malaria?

Obesity??

Well I could be a smart arse and say energy since all that exists within the infinite universe is made up of energy and there for what ever it is must be energy. Or I could take a random guess like every one else and say the human race?

Tuberculosis

Aids..TB or Malaria?

Or possibly some smoking related illnesses?

Death, which is the cause of every fatality.

aids?

Kebabs

stupidity

contraceptives

war

Cancer?