I'm closing in on 18 months, and I still don't have any VV devices to speak of. So there is no rule of thumb. I do alter my coil resistance, so in some respects I am changing the final wattage.
Vaporized PG is definitely considered to be an irritant to the respiratory system, so the less you consume the lower the irritation factor. PG and VG are metabolized and excreted through the blood and on to the systems of elimination in the body according to the reports I've read (kidneys, liver, and on to the waste elimination process).
So, the less vapor you produce and inhale, the less irritation you experience. The Drexel study shows the amounts ingested into the body from vaping. All appear to be within the FDA tolerances of ordinary human exposure. It's why I don't do sub ohm vaping. Why subject myself to increased levels when normal levels satisfy my need for nicotine and vapor? I use a VV Provari and a VV/VW Sigelei Zmax to tailor my vape to my personal satisfaction. I'm generally under 4v and mostly at 3.5v with a 2 ohm coil.
http://publichealth.drexel.edu/~/media/files/publichealth/ms08.pdf
I'm surprised you went 8 months on blue OP! But good on you for doing so!
I started with some mall kiosk cig-a-like called Smoke-Pass. It actually really wasn't terrible. However I spent 55 bucks for 2 200mah batteries and 3 cartos. Then I had to go back and buy a 30ml bottle of liquid that cost 25 bucks. Yeah...lots of money for nothing haha. But it was worth it in the end.
Now that I'm on these forums I realize what I was missing, but my Blu rechargeables produced a decent amt of vapor and I really liked the tobacco flavor. I am defn vaping much more now that I have my Kangertech and have started to love my bolder juice flavors
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My moment was having to change the Blu batteries every 20 mins. I do kinda miss the flavor of the Johnson Creek juice even tho there was hardly any throat hit. It had a nice subtle undertone. The juice I have is very bold, so I'll likely be constantly searching for my fave blend
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I was using Blu for 8 months until my battery started dying and just bought my first pair of Kangertech Evod batteries yesterday. Understanding everyone has personal preference, but at what point did you feel the need to upgrade to VV or did you just skip right to a Mod. What factors contributed?
Glad to be a part of this helpful group of vapers!