This means there is likely nothing he can do to prevent it from happening if it is going to happen, but neither will any of his activities increase the risk unless he were to start smoking.
Oku kuthetha ukuba akukho nto anokuyenza ukuyithintela le ngxaki ukuze ingaqhubeki xa iza kuqhubeka, kodwa azikho izinto azenzayo eziza kuwandisa umngcipheko ngaphandle kwaxa eqala ukutshaya.