I had a friend who's wife wasn't vaping while he was. What the husband and I did was get together and mix a bunch of flavors we knew she'd like. Next we and friends made it a point to vape these flavors whenever we got together. Finally he bought a cig sized PV and left it on a table. Didn't ask and knew she would never admit it but she was sneaking vapes LOLLLL. After 1 month she was a fully fledged Vaper. Didn't let her know about our strategy until she had been vaping fir 2 months. At first was slightly miffed when told but when we told her we did out of love and concern she was very touched and almost to the point of tears. She has now been involved in 3 "same type" conversions. When asked she told me it was the scent of the flavors and the fact she could vape alone without being judged, feeling she was committing or forced to vaping.
Good Luck.
Good Luck.