The major biologically active chemical compound in cannabis is Δ9-tetrahydrocannabinol (delta-9-tetrahydrocannabinol), commonly referred to as THC.
LOOK:
Notice the level of dependence and Physical harm of Cannabis compared to every other drug on this chart.
@ Paroxysm:
However, recent studies have shown that using a vaporizer for cannabis consumption appears to eliminate almost all of the health problems and objections related to cannabis use.