Typically, when assessing cancer effects, researchers assume that there is no threshold no level below which no cancer occurs) while when assessing non-cancer effects, researchers assume that a threshold does exist.

Question

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For cancer effects, it's often assumed that any exposure to a carcinogen could potentially lead to cancer, hence no threshold. For non-cancer effects, it's commonly believed that there is a level below which no adverse effects occur, indicating the presence of a threshold.

Typically, When Assessing Cancer Effects, Researchers Assume That There Is