If you're not smoking cigarettes, you have quit. Congrats! E-cig or not, you're not smoking. If you're smoking way fewer cigarettes than ever before, congrats on reducing! No matter what, less tobacco is a good thing.
Now there's no reason to assume it 100% safe, you know nicotine is an addictive drug that can be stressful to the heart and circulatory system. You know it's logically not safe to inhale anything but air. While PG and VG are known to be safe to inhale in low quantities, e-cig technology hasn't been around long enough for good long term studies as to how safe they are for long term frequent inhalation. No food flavoring is approved for inhalation, and any flavor containing diacetyl should be avoided because it's known to be quite dangerous to inhale in the long term.
But look at the basics, you were paying big prices for thousands of chemicals in burning tobacco, nearly all with health risks. Now you're paying less money for about 5 ingredients, and most of those are considered pretty safe, and none known to be carcinogenic. You're better off, even if you're not as well off as the smokers that quit cold turkey, even if you haven't stopped smoking entirely. You are now able to control your own nicotine intake, so it's up to you how quickly you want to wean yourself off nicotine for good, if you indeed want that. So while you can't see it as totally safe and risk free, you can view it as so much less harmful to you than smoking is, and if you've failed to quit with other methods then it's probably the method for you.