Question: am I at risk, now, for developing lung cancer, COPD any more so because of
vaping than I would have been if I didn't start this.
There have been no long term, scientific studies on the effects of vaping. In fact, there have been hardly any studies done on the effects of nicotine without the aspect of smoke. So, there is no easy answer to your question.
Common wisdom would suggest that cancer caused from smoking is from inhaling combustible plant material along with all the other toxic chemicals that are in tobacco cigarettes. We're still learning about the effects of nicotine alone. Nicotine does have very similar properties to caffeine, a stimulent found in a variety of products. Nicotine is a vasoconstrictor which can adversely affect blood vessels leading to hypertension, coronary heart disease, peripheral vascular disease, as well as new bone growth (fractures, bone & joint surgery).
You're not using nicotine, so your risk of the above is diminished. However, little is known of the risks of the vegetable glycerin, propylene glycol, or the flavoring agents found in e-cig vapor. It's not just "water vapor". Common sense would seem to indicate that the health risks involved with e-cigarettes are much less than with smoking, though.
My 18 y/o daughter was a non-smoker, but her boyfriend, brother, and closest friends all were smokers. She was feeling the usual peer pressures to begin smoking to fit in with her friends, and requested a vape setup for her birthday. She wanted to use 0% nicotine, just flavors, just as you are.
I reasoned that vaping 0% nicotine flavors was a better solution than to begin smoking. I recalled that I was her age when I began smoking, primarily because of peer pressure. It's been a year since she started vaping recreationally, and the side benefits have been that now her boyfriend, brother, and many of her friends are now vaping instead of smoking. Funny how that turned out.
I'd like for you to visit
CASAA. It has the most up-to-date information on vaping. I'd also strongly urge you to join (its free), as they are our vaping advocates against over-regulation of e-cigarettes.