A good lab report should test for the things that matter: nicotine content, presence of heavy metals, and potentially harmful compounds like formaldehyde or acetaldehyde. In some regions, there are specific requirements for what must be tested.

Check that the report includes the tests required by your local regulations. For example, if you're selling in the EU, the Tobacco Products Directive (TPD) requires certain emissions tests. If you're in the US, the FDA has its own set of expectations. Knowing your local rules will help you know what to look for.