Kinda bummed out I didn't jump in the "vape juice" biz when I got out of rehab May '16, when I found out how popular the shit was and how easy it is to make ("easy" if you're familiar with making/compounding oral & inj anabolics) & have sources for the materials. Nicotine powder is easy to obtain. We used a product in prison (in landscaping class) to kill aphids that was pure nicotine powder and cost like $12 for a kg.
Kg = 1,000g = 1,000,000mg
Considering 1 cigarette is something like 1.2-1.6mg, you've got like 30mg nicotine per pack, 1kg nicotine is equal to about 33,300 packs of cigarettes. Amazing profit margin considering your biggest expense is gonna be the 30ml glass dropper and propylene glycol.