High altitudes and dry air seemed to be the prescription / belief right up into the 20th century. Nixon’s brother died of TB I think, in a sanitarium in AZ or NM.
Harold Nixon became ill with tuberculosis in 1927. Richard Nixon attributed this to his father's insistence on serving raw milk. When his condition worsened in the spring of 1928, his mother left her two surviving younger children (Arthur had died three years earlier) with their father in Whittier, California and travelled 400 miles to Prescott, Arizona, where the weather was better for Harold's condition. He died on his mother's, Hannah Milhous Nixon, birthday.