Validating common suspicions, a new ChangeWave study suggests that the resignation of Steve Jobs as Apple's CEO has had little impact on buying habits. As of September, his exit was less of a factor than ever in Apple's history since he returned in 1997, with only four percent saying they expected to change their habits. Worries were much higher in June 2008, at 18 percent, just as Apple was releasing the iPhone 3G and had yet to even hint at the iPad.