Yeah, unfortunately health care providers speak in generalities. Many people do experience a significant drop in their blood pressure after quitting smoking. My husband had that result.
But, non-smoker's deal with blood pressure issues, too. Even when they exercise and maintain a healthy weight. Genetics play a HUGE role.
I hope there is just a delay for you in the downward trend of your blood pressure. Keep some hope! In the meantime, the b/p meds are a necessity, obviously. You don't want to increase your risk for stroke or heart attack.