The DOT has a list of interesting studies on the active transportation in the form of walking and cycling https://www.transportation.gov/mission/health/active-transpo...

You can also search for studies that compare the societal cost/benefit of using a car vs a bicycle. The generally accepted conclusion is that cars have a cost while cycling has a benefit for society.

That's not what I'm saying. Based on OPs phrasing, their specific bike was marked as a health hazard. Maybe their bike is painted with lead based paint. There could be a million reasons a specific model could be unhealthy.