Marijuana and hemp indeed both come from the cannabis family. The difference between the two is their chemical makeup, particularly their levels of psychoactive THC. Hemp does not contain a level of THC higher than 0.3%, while marijuana can have a THC level of up to 30%. The very low percentage of THC in hemp will be nearly impossible to get high off of, while the 30% level of THC in marijuana will definitely make you high.
Vaporizers – Many state-licensed cannabis dispensaries offer high CBD strains of cannabis flower. This allows for reduced risk of paranoia while allowing for a high medicinal dose of CBD. Vaporizers are used to heat up the flower and remove the properties or compounds of the plant that you are looking for without combustion or smoking. Vaporizers use convection much like a convection oven.