I was doing that with disposable vape pens called elf bars I got into for a while as they tasted so nice, I order my vape juice off ebay as my favourite flavour is discontinued you can only buy it in shops as a nic salt 5mg, not the normal juice
I bought an elf bar after seeing them at the vape shop and asking what they are, as I'd ran out of juice and had to wait for it to be delivered, the elf bar was so nice I bought 4 different flavours over 2 days lol, then I kept buying them, but they are 20mg so I could only have 4 little puffs anymore and I'd be jittery and wired as was used to 0.3mg lol, but at the time the valium I was buying for sleep was underdosed shite so I kept waking up, and puffing on the pens and obviously making the insomnia worse, I'm not sure why the strength of them elf bars is only available at 20mg, even the vape shop said its stupid as loads of customers want them in a lower dose, they only lasted a few days though and I wasn't even puffing them much, I'm almost drooling remembering the flavours now lol