All of the above- better taste, heightened sense of smell, less breathless, more energy generally.
Other stuff... I used to suffer from intensely cold hands and feet, no doubt brought on by poor circulation from smoking 20-30 roll ups a day for 30 years- now my hands and feet are warm pretty much all the time.
I have also LOST weight since stating vaping- my 'sweet tooth' has deserted me and I no longer feel the need to eat a massive bar of galaxy chocolate every night!
I have also noticed that my 'old injuries' don't give me as much hassle as they used to- having broken my back twice, my neck once, had a frozen shoulder and hip bursitis from various tumbles from horses in the past, I used to be in constant pain.. it may be coincidental, but my pain levels have decreased massively since stopping smoking and starting vaping.