Once you've covered the basics, these extras can give you a competitive edge—but they're not deal-breakers.

• Third-party lab results: Some manufacturers publish nicotine and e-liquid analysis. If they do, that's a trust signal.
• Teardown videos: Even if you don't open the device yourself, watching a teardown can reveal build quality issues.
• Fast charging support: Not essential, but nice to know for your marketing if the device supports it.
• Replaceable coils: For disposables, this is rare, but if a model offers it, it's a selling point.