Hi
@Emm-y and welcome to the planet.
i will start with a ikkle rant.
"Also I read somewhere about an e-cig trial found that if you aren't vaping a high enough nicotine dose for your needs you will obviously compensate by smoking more of the lower dose but it said this is bad for you because you are inhaling more cancer causing chemicals?"
all i can say on this is its total bollocks and most prob from america where they talk out of their asses.
i can agree with it if the above was about cigs as yes, if you smoked say silk cut you would take deeper drags to get the same hit as say a bensons or marlboro so yes there was a higher risk but with cigarettes only. vape only has 3 or 4 ingredients. VG / PG / flavouring / nicotine.
nicotine is as bad as coffee. unlike tar in cigs which is what has the cancer causing carsogens by their thousands in it.
now back on track
the vape shop was right if you are using a smok tank which are subohm which use higher wattage so need lower nicotine or you would get a head rush even with 9 or 12mg and nausia.
subtanks are for big clouds so much higer wattage which in tern uses much more juice. these are classed as direct to lung tanks.
mouth to lung tanks are the opposite. they use much lower wattage average 10-14watts so use a lot les juice so can take much higher nicotine like 12 or 18mg
using 10ml in 2 days is good going in a subtank. i average 35ml a day.
youve come to the right place for advice and theres always plenty on to help out no matter how stupid you might think the question is its normaly not so ask away.