I've had the most success in getting folks to quit tobacco over the years by offering the following information:
For men-tobacco smoking has been linked to a higher incidence of erectile dysfunction (E.D.).
For women-tobacco smoking has been linked to a higher incidence of facial wrinkles.
A quick discussion about the loss of sexual potency and looking older than others your age who don't smoke seems to create a lot more interest in quitting than reviewing the list of possible cancers (lung, oral cavity, pharynx, larynx, esophagus, stomach, pancreas, bladder, kidney, and cervix), especially in the younger population.
It's not surprising.
Whatever works is fine with me.