<i>&quot;Please point to the scientific research that states that psychedelics definitely do not affect your rectum&quot;</i><p>Scientific research doesn&#x27;t work like that. Scientists don&#x27;t set out to prove that links between arbitrary things <i>don&#x27;t</i> exist.<p>Because there&#x27;s no research that disproves any link between toothpaste and baldness, doesn&#x27;t mean we can&#x27;t use common sense based on what we know about toothpaste and baldness to all but rule out any link in the absence of that research.  What we do know about toothpaste and baldness, does not point or suggest any link between the two.<p>Likewise, what we know about psychedelics and cancer of the rectum, is that the two would unlikely be connected. From the extremely small amounts of drugs needed to affect consciousness, to the aggressive disease attacking your cells. Even in a biological sense they are worlds apart.<p>Finally, the &quot;mind over body&quot; idea is more about our minds over our healthy bodies - keeping things such as blood flow and other systems healthy. Once those cancerous tumours start growing, there&#x27;s no scientific data or even a reasonable theory to suggest &quot;the mind&quot;, be it under the influence of drugs or not,  has any fighting ability to repair localised cancerous cells and prevent further spreading.