you probably don't even need the caffeine or if you do, very little. The only use for it is to make it run better. Most H is cut with it anyway because dealers assume that their users would potentially be smoking it and it is a cheap cut. Laced cigarettes are pretty much a waste, it burns the dope rather than vaporizing it for the most part. It's just gonna clog up the element rendering the vape rig useless. I'd personally try without the caffeine and if it won't "run " like is should, just add a little bit.
Smoking is actually the fastest ROA contrary to popular belief, if you can master it you're likely going to get more bang for your buck
Hmm actually about every single point in this post is incorrect.
You can absolutely vaporize H in an E-cig. Technically the best thing would be #3 (the base form) since it has a lower vape point, but the problem is #3 usually has a bunch of gunk, and will clog the hell out of your vaporizer. If you obtained #3 in the optimal form, you would likely call it #4 anyway.
The main concern is that #4 (the salt form) has a higher vape temp, I don't know the exact figures but the melting point is something like 243 degrees, so you would need to get a little more than that. The good thing is, I think most vaporizers (again I don't know exact figures... you'll have to do your own research) average about 250 degrees, which would be good in this case.
To address the caffeine mentioned in the quoted post, it is added is because it actually reduces the vape temperature required for heroin salt to evaporate. I'm not a chemist so I couldn't really explain the why really well, but caffeine acts as an excipient, reducing the melting/vaporizing point of heroin salt (#4). This would be why it 'runs better'. Regarding smoking being the fastest ROA, I guess that's correct if you don't include injection. It's true that they have a comparable speed in effect (although injecting would still be faster), but the real difference here is quantity. You can pretty much put as much dope down into water and into your veins as you want. At higher amounts, there's not way in hell you'll be able to breath in the smoke, hold it in, and absorb the heroin that you can in an injection. After you inject into a vein (from pretty much anywhere), the blood goes directly to your heart, through your lungs, and into the brain. If you factor the time it takes for alveoli to absorb the heroin from smoke, IV is faster (even by only 5 seconds), but this difference is only important at higher doses that would start to make you choke.
Regarding meth added to vaporizers, you can absolutely 100% do this without any further consideration, and it would actually probably result in less product loss (since most tweakers tend to just put a torch to glass and burn the shit out of their meth, at least in part).
EDIT: also, the nicotine content will have almost no bearing on this. As far as I know it doesn't act as an exipient in any way, so the nicotine here is not a factor. What is a factor is the solubility in propylene glycol and vegetable glycerine (since most juice has no water as some people will say, although some have alcohol), the ratio you have of this liquid, and the amount of heroin you are adding taking into account the amount of liquid.
