Hi Tomasius.
Thanks for sharing your experience. I also smoked cigarettes in the past, for 10 years between 1 and 2 packs a day. I smoked my last cigarette 25 years ago and switched entirely to smoking only cigars and pipes, without inhaling and in moderation (one pipe/cigar every 2 days). It was my personal effort in "harm reduction" at a time when something like e-cigs were not available. My cardio vascular condition vastly improved, so it was one of my best lifestyle decisions.
A year ago I started vaping not because I wanted to quit smoking my cigars and pipes (which I enormously enjoy), but because vaping is equally enjoyable but much more practical: you just press the button and vape as long as you want, you can keep the e-cig in your pocket when not vaping, there is no fire and no ash to get rid off, and the vapor dissipates very fast leaving no traces. The tobacco law in Mexico forbids smoking in our offices at UNAM ("espacios libres de humo"), but the law is not clear about vaping. So, I managed to get authorization to vape in my office because I argued that the e-cig vapor is not tobacco smoke ("no es humo, es vapor"). In fact, I put this argument in terms of the different physical and chemical properties of the smoke and the vapor. I can always find in many restaurants a quiet spot for a discreet vape and nobody notices. I could never do all this with my cigars.
You mention that you are convinced that there is some harm to your health in vaping. Less risky than smoking, but not zero risk. There is no substance (eaten, drunk or smoked) in nature that is totally absolutely risk-free. I have read a lot of the scientific literature on e-cigs and vapor. A good review of the literature is found in this link:
The Ultimate List of E-Cig Studies: Are E-Cigs Actually Safe? *Updated 2/16/14 – Vapex
A specially good reference is the article "Peering through the mist: systematic review of what the chemistry of contaminants in electronic cigarettes tells us about health risks" by Igor Burstyn, that you can download in this link:
Peering through the mist: systematic review of what the chemistry of contaminants in electronic cigarettes tells us about health risks
These are all "short term" studies because E-cigs are a new technology that has been used extensively for less than 10 years, which is not sufficient time for epidemiological studies on its long term health effects, but the same can be said of many new consumer products (cell phones), food (genetically modified) and many medications that are often released into the market after less than 5 years of study on laboratory animals.
We know that vaping has not produced health problems in vapers in their 10 year usage. Can we be 100% absolutely certain that zero (absolutely zero) long term decades long effects may arise? No we cannot, but on the basis of what is known I believe that we can rest reasonably assured that possible long term health risks from vaping are close to zero, or possibly close to long term health risks of eating ice cream or yogurt, more so if vaping without nicotine.
I am also a libertarian and completely despise the paternalistic and prohibitionist impulses of the "Public Health" medical establishment (doctors and regulators). I will keep vaping and smoking my cigars/pipes regardless of what they say and will fight to be able to vape and smoke LEGALLY in bars and restaurants (say, in separate rooms to avoid bothering non-smokers and non-vapers).
As you say, vaping is not only under attack by the prohibitionist and puritan "healthist" ideology of many doctors, but by powerful vested corporate interests. In fact, I would argue that the pharmaceutical industry is more to blame than the cigarette industry. Big Pharma knows that their patches and gums are rubbish, so they have more motivation to destroy the consumer vaping industry to be able to sell e-cigs as medication, not as a consumer product (they tried this and failed, but they keep trying because it means a lot of $$$$).