One thing you will find for sure is besides wattages and voltage settings will be varying hardware combinations having a large effect on specific flavors as well as the eliquids as far as the PG/VG ratio. After this amount of time I still find myself scratching my head at either a new one or one I haven't tried on the better gear.
Another thing that can get a bit involved at times is the actual science since no one knows what the long term effects will prove to be since vaping while not new in concept has only been on the market now for a decade starting off with some crude cig look alikes. As the hardwares and eliquids have made quite a bit of progress the more positive side of things is starting to be seen as well as more medical sources avoid the scare tactics to reveal some interesting benefits I have also heard from a number of people already with pre-existing conditions.
Here's one report regarding asthmatics who smoked finding health benefits are being seen when switching from smoke to vapor.
HOUSTON – Asthmatic smokers who switched to electronic cigarettes showed evidence suggestive of respiratory harm reversal in a retrospective pilot study.
“Electronic cigarette use improves respiratory physiology and subjective asthma outcomes in asthmatic smokers. E-cigarettes are a safer alternative to conventional cigarettes in this vulnerable population,” Dr. Cristina Russo declared at the annual meeting of the American Academy of Allergy, Asthma, and Immunology.
The full report that came last month can be seen at http://www.familypracticenews.com/ho...a8cffb3c5.html