This is straight off Health Canada's website;
2.2.1.2 Vaporized ........
Vaporization of ........ has been explored as an alternative to smoking. The advantages of vaporization apparently include the formation of a smaller quantity of toxic by-products such as carbon monoxide, polycyclic aromatic hydrocarbons (PAHs) and tar, as well as a more efficient extraction of ... from the ........ material (47,48,49,43,50). The subjective effects and plasma concentrations of ... are comparable to those of smoked ........ with absorption being somewhat faster with the vaporizer (43). The vaporizer is well-tolerated, with no reported adverse effects, and is generally preferred over smoking by most subjects (43). While vaporization is amenable to self-titration (49,43), the proper use of the vaporizer for optimal administration of medicinal ........ has to be established in more detail (50). The amount and type of ........ placed in the vaporizer, the vaporizing temperature and duration of vaporization, and the balloon volume are some of the parameters that can affect the delivery of ... (49). Bioequivalence of vaporization compared to smoking has not been established.