Are natural wax fire-starter cubes safe for cooking and grills?

Manufacturers and verified-purchase reviewers describe paraffin-and-wood-shaving starters as food-safe and largely odorless, which makes them popular for charcoal grills, pizza ovens, and kamado cookers. Specialist BBQ and charcoal subreddits widely use them and note they light in seconds even when damp, though some users say very cheap bulk alternatives can be just as effective.