WB Cherry!
First let me say that all the things on this site are not documented, and if something is in your brain, this is the place to post it because the feedback is great. And the truth is WE DON"T KNOW. So on this site we are all learning. We don't know if e-cigs are harmful, but most of us that have converted to e-cigs believe they are safer. I have actually read a report, and I cannot remember where (I Will look for it) that touted the benefits of nicotine, and have seen blood vessel expansion that got more oxygen in the body.
Personally, I vape more than I smoked, and I am probably getting more nic than I used too. But my lungs feel better. I could not quit smoking until I started vaping. One day, I may have to try to give up vaping, but not today.
I do believe (sorry, no proof) that vaping is not as unhealthy as smoking, and I hope you will give it another try.
And yes, I think we will continually see modifications of the e-cig. Peoples tastes are so different, and what hey want will be invented. That is great, and it should produce better products. Additionally, the crappy makers will be put out of business. But even if the crappy makers get someone off cigarettes, that is a good thing to me. Personally, I am pretty simple and am content with a battery stick and a cartomizer. But I am glad that there are so many options to appeal to a wider variety of people.
I hop you give it a try again. Best wishes!