mixing them is very straightforward, get yourself a 100ml glass measuring cylinder, pharma grade pg and vg from ebay, flavouring from an online vendor, etc, it is much much better than buying random bottles of god knows what you get in the shops.
what is the recommended ratio of pg to vg? 80% to 20%? Also could you PM me any good sources of nicotine powder and flavourings if posting them publically would in some way break the BL rules. If you get the chance it would be much appreciated. I once tried buying extra strong 24mg nicotine juices and then diluting them with 20-25% pg, but that did not work very well, ive since found out that the taste is the same as the juices you can get from corner shops, ie they must be stingy on the flavorings or using too much pg.
Fubar i would wholeheartedely recommend the Aspire Nautilus mini tank with a Mini Eleaf battery (£45 quid the lot) and both will last for ages, mine are 6 months old and still going strong. The battery is variable voltage from 3.4v to 5v, i use around 4 volt, higher voltage means more vapour and nicotine in each inhalation, but in the light of 'that study' i might try to keep the Vs down, although it doesnt feel "hot".
They look pretty cool too imo and will easily fit in your jacket pocket, especially if you don't use a collar which probably isnt really necessary (see next paragraph if interested)
The only thing that can go is the thread so i've bought a collar for £1 or £2 that sits in between the tank and the battery, meaning i wont have to keep on unscrewing and screwing the tank back into the battery every time it needs refilling. The threads on these things can be a bit soft. But seems to be less of an issue since i switched to the eleaf from the long and thin cylindrical batteries which are on their way out apparently, due to the greater charge and longevity of the newer generation of batteries. Plus you don't need to unscrew anything to charge these, there's a usb socket on the battery, rather than using a screw in charger like the older cylindrical batteries did.The wicks are £2 each and will need replacing anything from 1 day - 1 month depending on a variety of things. Even premium juices are cheap; £10 for 3 x 10 ml containers which will easily last a week. I'm easily saving at least a £100 a month on tobacco costs i guestimate.
Imo you wanna avoid the tanks with built in wicks at the top. All 'wicks at the top' tanks are very prone to burning out really quickly which isnt funny at £7 a time. You can get 'top down' tanks with replacable wicks, so you just have to pay £2 to replace the wick, But they still have the short wick life span problem imo. Wicks at the bottom of the tank last longer mainly cos they are constantly saturated. It's best to let a new wick to soak up the juice for 30 mins after replacing it, before you start vapeing for a longer wick life. Although you can 'cheat' a bit with the Nautilus wicks and squeeze a couple of drops of juice into the open top of the wick before you fit it, and then it will start soaking in from the bottom up too.