Can you call or write the son and DIL asking them to refrain from mentioning her smoking?

Incremental harm reduction is worth it, btw - ecigs need not be completely harmless to be an attractive option for her. As long as there is less harm, it would be a welcome change. My dad, btw, had a wake-up call that led him to switch to ecigs after decades of chain-smoking, and that wake-up call was the diagnosis of diabetes type II.