Before you even talk pricing, run through this quick checklist. It takes five minutes and can save you from a costly mistake.

• Seller's license: Ask for their business license and, if required, a wholesale or retail tobacco permit. A legitimate seller will have these ready.
• Product documentation: Request the FDA marketing authorization status for each product. If they can't provide it, that's a red flag.
• Packaging labels: Check that each product has the required health warnings and ingredient lists. Missing labels are a quick no.
• Local rules: Look up your city or state's regulations on vape sales. Some areas have flavor bans or specific packaging rules.

If all four check out, you can move forward with more confidence.