Have there been any indications of causal connection with use of abuterol based or other COPD inhalers to Bladder Cancer

I was diagnosed with bladder cancer 4 years after beginning use of abuterol based inhalers for (first) asthma (then copd) and have been using the inhalers ever since with increasingly aggresive bladder cancer.
Most long term smokers are on the same inhalers I use ...what is the connection??