My partner consumes 2 tanks of 9ml daily. The colleague, the dog, it would be better if they drank it. 
The twisty ones are better. A good RDA or RTA has no equal. And if that RDA is on a squonk mod, wow. For example, a Topside Dovpo dual with 10ml in the device, and the other tank in your pocket. You can set off then.
Just the pumping!
