I have always preferred a pipe, bongs lose something for me and joints are really wasteful.
I have many friends however that have said to me, "once you vape, you will never smoke any other way again".
After trying their vape devices, I must say they are almost right, but I love my ancient bamboo pipe, she is like an old friend and to stop using her would feel like I am cheating on her!
But be assured, vape pens are good and you will get just as high as with any other method, but there is a learning process to fine tune them to your preferences.
I don't know about eating left over vape weed, unless you need more fibre in your diet, as all the terpenes and cannabinoids have gone - evaporated!
Cheers, Organoman.