One does not need a PhD in chemistry or botanics or horticulture, or genetics or anything else to know, for example:
* This cannabis was produced without the use of a potentially toxic pesticide.
* This cannabis has been treated with no other adulterant.
Even knowing very little about the specific properties of the cannabis one consumes, one can have a high degree of confidence that it will not cause harm if they have grown it themselves.
The way we know the harm a material (plant byproduct, animal byproduct or synthetic compound) will do to a human body is by its history of ingestion by humans. Yes, we may have a longer informal history of ingestion of cannabis.
>Yes, we may have a longer informal history of ingestion of cannabis.
Yes, and the reason we have to rely on that informal history is a political one, which has resulted in the avoidance of primary research on the effects of cannabis consumption.
* This cannabis was produced without the use of a potentially toxic pesticide.
* This cannabis has been treated with no other adulterant.
Even knowing very little about the specific properties of the cannabis one consumes, one can have a high degree of confidence that it will not cause harm if they have grown it themselves.