Is it I have that effect or affect on people?
Keeping this in view, is it an effect or affect on someone?
Affect is a verb meaning 'influence or cause someone or something to change': New technologies continue to affect how we live. Effect is a noun that means 'the result of an influence': The pollution in the city had a bad effect on me.
Beside above, what does I have that effect on people mean?
Most of the time, you'll want affect as a verb meaning to influence something and effect for the something that was influenced. The difference between affect and effect is so slippery that people have started using "impact" as a verb instead.
The verb affect means “to act on; produce an effect or change in” as in, “the cold weather affected the crops,” (it produced a change in the crops … probably killing them). So, when you're looking to use one of these two terms to express an action, chances are you're looking for affect.