Dosage is difficult to control. Some undesired byproducts may be released during heating.
Pills give delayed relief where as inhalers give immediate relief.
Oral cannabinoids, especially in food, has unpredictable results. A medical doctor or a prescribing nurse will be much more comfortable prescribing a well-designed THC inhaler than a cannabis cigarette, tincture, or bhang, etc. Other advantages of a pharmaceutical inhaler device. In addition, an inhaler provides instant action as opposed to the long delay and unpredictable potency of oral prepations. Also, such a device allows people to schedule shopping, work and driving activities in a more flexible manner than is possible with other methods of use.