[trick-or-treat]

How much heavy meals can be hiding in a pinch of cumin realistically? Maybe you should invest in a metal detector.

[account42]

The problem with lead (and presumably other heavy metals) is that exposure is cumulative as it gets accumulated in your body so there really isn't a safe amount.

[trick-or-treat]

While that's true (we should generally avoid ingesting lead).. Lead also gets excreted reasonably quickly.

In other words it's not a reason to avoid a few occasional pinches of cumin.