because some marijuana retailers/dealers can easily mimic real marijuana even if it's not in its purest form. there are hundreds if not millions different types of strains and each have their own color potency smell and side effects. because the drug can be easily manipulated it can potentially harm you if you arent careful buying it from the right sources. This would be a prime example of synthetic cannabinoids. very dangerous and very lethal again if you dont know what is in your marijuana
