I've read up on how to use each of these properly, had it explained to me many times in many ways and I still cannot get it. Occasionally I'll be confident that effect is right but I'm less sure when I should use affect. Am I right in saying it can never be "an affect" and could someone please tell me the correct one in these sentences to try and make it finally make sense to me.
The traffic really effects/affects my journey time.
The traffic effected/affected my journey time.