Smoking causes cancer.
I don’t know about bone health but daily 5000 units of D3 has kept me virus free for 16 years, my wife for 14 years and my three offspring for varying amounts of years depending on when I could induce them to start. D3 has ended manic depressive cycles for three women I know including one daughter. With all three the results were manifest within 2 weeks to a month. Bone health is the least of my concerns ,actually.