The only harm i see in vaping really is if you get spitback from the atomizer and allergies if you have any and that you get less breathing because its still inhale...
I might point out that even though the OP is not using nicotine in his e-liquid, he could be setting himself up for an addiction regardless. There is more to the "addiction" phenomenon than "physical addiction" to a drug or substance.It is not a huge risk, perhaps, and compared to smoking, preferable. No doubt. But OP is not transitioning from smoking, but from just breathing.
The risks, however low, are non-zero and greater than his baseline. That is why i would always discourage a non-smoker from starting to inhale any foreign substance. As has been said, he will do what he wants anyway.
Psychological or behavioral addiction is still an addiction. For example, a sex addict has a behavioral addiction. The "hand-to-mouth" behavior and "desire or need to inhale/exhale a substance" behavior of vaping can become an addiction. As much as the OP has been vaping in such a short period of time makes me think he is well on his way to a behavioral addiction.
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