From the research I've done, it seems to be the case that if you wanted e-cigs that work well 'down there', you'd be best placed to get ones with as high nicotine content as possible and with a VG base. Does anyone have any thoughts on this? I note that some vapers say that e-cigs still won't give that same urge that normal cigs do, and I guess everyone responds differently to these things. But if I could give myself the best possible chance of finding something that works, that would be great.
I have not experienced any laxative effect from vaping as I used to with smoking.
I know that even with high nicotine content juice your blood nicotine level will not rise as fast as when smoking a cigarette. If you want to try to get the most nic you can from vaping, try a high nic juice with a higher power mod and a tank that can handle the power. The more nic in the juice the less power you'll need to get the same nic per drag. What I have in mind is 24-36 mg/ml juice and say 20-30 watts. You don't need flavoring in the juice, unflavored will likely taste a bit like a cigarette anyway. What you need to be careful of is that you do not vape too much or you'll get too much nic into yourself. It hits slower than from smoking, but we typically only take 8-10 drags per cigarette over a few minutes and then put it out. With vaping it's easy to keep going longer and get too much nic over time.
Typical symptoms are nausea and raised heart rate, the same sort of thing you would get from smoking too much too fast, or drinking too much coffee. The high nic and power are also going to combine to give you a lot of throat hit. Start slow and work up as you get to know how you respond. Short drags at first too so you don't end up coughing. IMO it doesn't matter if you're vaping PG or VG, this will be all about the nic.
This is a good start to getting more nicotine from vaping. I have no idea if this will help you because there is a lot more than just nic in cigarette smoke. In the end all you can do is try it and see.
If you decide to try it, start slow, keep in mind there are a few variables involved, that a cigarette is only about 8-10 drags and it's done and if you feel any of the symptoms of too much nic stop vaping before it gets worse.