Chris_Soucy/GettyIn recent years, we’ve seen a sizeable shift in medicinal cannabis prescribing, to products containing higher levels of THC (tetrahydrocannabinol) – the component that can cause drowsiness or a high. Now, our new study shows some of the harms with this shift, including from products containing far more THC than naturally found in cannabis plants. We found more than half of all cases of adverse events involving unapproved medicin…