Dark-fired tobacco is cured by smoking the leaves over hardwood fires (oak, hickory), which infuses the leaf with smoke character and produces a darker, drier, smokier flavor
E-liquids on the market will usually provide six standard nicotine concentrations such as 0 mg/ml, 3 mg/ml, 6 mg/ml, 12 mg/ml, 18 mg/ml, and 20 mg/ml, with 10 bottles being the standard in regions like the UK (due to TPD regulations)
We always strongly recommend testing the coils with ohm-meter before using them with your mods, devices and batteries
That way, you'll discover what makes a vegan vape and if there are in fact any animal ingredients in vapes
This goes on for at least two years
So Hasidim are laxer about smoking than about many, many other things