I have only been able to find one known cause of CML - excess exposure to radiation. It is not hereditary. I smoked for 25 years, but this has also not been linked to CML from what I have read.
When I was 10 years old in 1963, my family moved to a house outside Philadelphia PA. I lived in that house until I finished college in 1976. During my teen years, I spent a lot of time in the basement, first remodeling it and then playing pool and ping pong. When my parents sold this house in 2012, the radon gas inspection was positive (they didn't do this inspection in 1963). Could exposure to this radon gas have caused my CML? Neither of my parents got CML but neither of them spent much time at all in the basement - my father died of natural causes at age 91 and my mother just celebrated her 99th birthday cancer free her entire life.
If this didn't cause my CML, what did? What caused your CML?