The causes of marketing effects (and hangovers) are not always so easy to determine. Most of the time it's the culmination of many factors. Oftentimes your prospects and customer don't remember where they first heard of you. So the question is, "Which one caused them to reach out? Marketing effects take place over time and it's challenging to isolate which one "worked". The point is that you need to be consistent in your marketing and realize that the seeds you are planting today will grow into business in the future.