effect n. affect v.

The medicine had a positive effect on his health. 

The weather will affect our travel plans.  

The weather will have an effect onour travel plans.

effective  adj  effectiveness noun

influence /ˈɪnfluəns/ n. v.

Impact//ˈɪmpækt/ n. v.

Her ideas  influenced my decision.

Exercise can impact our health positively.

Therewas no influence from outside.

He lost one leg in the war. That had ahuge impact on his life.