Many people have thought that calamus mentioned in Ex 30:23; Can of Cant 4:14 & Ezek 27:19 is the same plant as marijuana. The only problem is that the word calamus in the bible refers to an aromatic reed.Packer and Tenney define Calamus as, “A tall reed-like grass with hollow stems. The Hebrew term for this plant (Keneh bosem) means ‘reed of fragrance.’ It is indeed a very sweet-smelling plant (Song of Sol. 4:14).” Elwell and Comfort define calamus as, “ a variety of sweet-smelling cane.”  Everyone knows that marijuana is not a sweet-smelling plant, so calamus in the bible would not be the same as marijuana.
If cannabis is an edible plant, then it is covered under the divine and moral permission of the word of God (Ex 30:23, Ezk. 34:29, and Rom 14:2, 3, 13-17). As with every medicine, if used in excess, you will suffer the consequences. I truly believe that if hemp oil is well extracted from the marijuana plant, it could do wonders just as we use many plants in Africa for healing. I have used different herbs to treat different diseases that I don't see the fuss about using marijuana for medicine. If you have abnormal heartbeats you could use watercress plus milk, you could use garlic, ginger and turmeric to control or eliminate your hypertension. There are at least 20 plants that I can give anyone to treat different ailments. That should not be different with marijuana simply because it has THC. If any Christian intends to use it, they should consult their different laws and regulations.