drug (drg)
n.
1.
a. A substance used in the diagnosis, treatment, or prevention of a disease or as a component of a medication.
b. Such a substance as recognized or defined by the U.S. Food, Drug, and Cosmetic Act.
2. A chemical substance, such as a narcotic or hallucinogen, that affects the central nervous system, causing changes in behavior and often addiction.
3. Obsolete A chemical or dye.
tr.v. drugged, drug·ging, drugs
1. To administer a drug to.
2. To poison or mix (food or drink) with a drug.
3. To stupefy or dull with or as if with a drug: drugged with sleep.



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Cannabis is a plant
plant may be a manufacturing facility. This article is about the living things.
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Plants are a major group of living things (about 300,000 species), including familiar organisms such as trees, flowers, herbs, and ferns. Aristotle divided all living things between plants, which generally do not move or have sensory organs, and animals.
Genus (plural genera) is a grouping in the classification of living organisms having one or more related and morphologically similar species. In the common binomial nomenclature, the name of an organism is composed of two parts: its genus (always capitalized) and a species modifier. An example is Homo sapiens, the name for the human species which belongs to the genus Homo. See scientific classification for more details of this system.
From a different piece of literature:
The heart of the book is divided into specific chapters that discuss all of the major drugs of abuse: tobacco/nicotine, opioids, CNS depressants (alcohol, barbiturates, benzodiazepines, solvents, inhalants), marijuana, and CNS stimulants (cocaine, amphetamines). Of interest, there is an entire chapter dedicated to "club drugs," namely, gamma hydroxybutyrate, 3,4-methylenedioxymethamphetamine (Ecstasy), and ketamine.
Separating CNS depressants, Stimulants, and Marijuana.







LITERATURE OF MEDICINE
Reviews, Notes, and Listings
A Handbook on Drug and Alcohol Abuse: The Biomedical Aspects
15 March 1993 | Volume 118 Issue 6 | Page 478


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A Handbook on Drug and Alcohol Abuse: The Biomedical Aspects.
Gail Winger, Frederick G. Hofmann, and James H. Woods. 219 pages. New York: Oxford University Press; 1992. $49.95.

Social, pharmacologic, medical, and legal topics relevant to the abuse of tobacco and nicotine, the opioids, central nervous system depressants (alcohol, barbiturates, benzodiazepine, volatile solvents), hallucinogens, marijuana, and central nervous system stimulants (amphetamines, caffeine, cocaine). The last three chapters cover medical diagnosis of abuse, management, and legal controls. A well-written, highly readable, adequately documented survey of these widespread problems.

Again, seperating CNS Stimulants/Depressants and Marijuana.

Let's look at the definition again.

drug (drg)
n.
1.
a. A substance used in the diagnosis, treatment, or prevention of a disease or as a component of a medication.
b. Such a substance as recognized or defined by the U.S. Food, Drug, and Cosmetic Act.
2. A chemical substance, such as a narcotic or hallucinogen, that affects the central nervous system, causing changes in behavior and often addiction.
3. Obsolete A chemical or dye.
tr.v. drugged, drug·ging, drugs
1. To administer a drug to.
2. To poison or mix (food or drink) with a drug.
3. To stupefy or dull with or as if with a drug: drugged with sleep.

Marijuana's a cure.
Marijuana is recognized as an illegal intoxicant.
The definition of Cannabis is above.
And this last one is not what Marijuana does. It doesn't affect your CNS.
2. A chemical substance, such as a narcotic or hallucinogen, that affects the central nervous system, causing changes in behavior and often addiction.

Prove me wrong!!! Time and Time again.