I wasn't around, but you can look back and see when tobacco was physician approved in the 30's/40's/50's. I agree with JamesG. Too much unknown in vaping. I would assume the quality of ingredients(chemicals?) used varies greatly. Another problem I see with vaping is the wide assortment of...
I'd suggest looking into the studies coming out showing how bad vaping is as well. You may be trading one bad habit for another. If you want to see your grandchildren grow up, you need to stop it all together, along with looking at your diet and exercise routines. I'm not a full time smoker...