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As long as that takes more than 60 days it won’t interfere with their study. Absolute non-toxicity wasn’t the goal here.

He did not need to show it was safe, only that it did not interfere with the study

As with everything it's a function of dose. A few molecules of soot entering the brain will trigger some cleanup and the glia cells will suck it up.

Breathing soot every day and caking your lungs with it over time raises your risk of cancer.

If our body was not built to handle homeopathic doses of toxins, we'd all be dead.