Marijuana is a greenish-gray-brown mixture of the flowers, seeds, stems and leaves (dried and shredded) of the Cannabis sativa plant, an annual herbaceous plant belonging to the genus Cannabis L. This plant grows wild in many tropical and humid parts of the world and has been cultivated for thousands of years as a source of industrial (hemp) fiber, animal feed, hempseed oil and medicine; and for its recreational uses brought on by the main psychoactive chemical it contains, delta-9-tetrahydrocannabinol (THC).
THC is found and extracted from resin produced by the leaves and buds of the female plant. Over 500 other compounds chemically related to THC can be found in the Cannabis plant. Over 100 of these compounds are called cannabinoids.
Screening Cut Off and Detection Time for THC
Just like any drug, screening for marijuana is guided by clear cut-off levels that vary depending upon the type of sample used. There are also different cut-off levels for screening and gas chromatography mass spectrometry (GC/MS) confirmatory testing because they use different testing methodologies.
Different testing methods = different cut-off levels.
The immunoassay tests done during initial screening are intended to detect a wide range of compounds that are chemically similar and that react with antibodies contained in the reagents. The GC/MS confirmatory tests on the other hand look for specific metabolites that identify and quantify a specific drug.
|Screening Cut-Off||GC/MS Cut-Off (confirmatory)||Approximate Detection Time|
|Urine Drug Test||50 ng/mL||15 ng/mL||15-30 days|
|Saliva Drug Test||50 ng/mL||15 ng/mL||6-12 hours|
|Nail Drug Test||1 pg/mg||50 pg/mg||From 3-6 months after use|
|Hair Drug Test||0.1 – 1 pg/mg||0.3 – 50 pg/mg||From 5-7 days after use up to 90 days|
DEA Drug Class
Marijuana is classified under Schedule I of the Controlled Substances Act which lists drugs, substances or chemicals that have a high potential for abuse with no current medical use. Examples of other drugs in this class are:
Marijuana is perhaps in the unique position to be able to claim that it is a stimulant, a depressant and a hallucinogen rolled into one. Different people react differently to marijuana.
- As a stimulant, marijuana enhances mood, boosts confidence and self-esteem and produces feelings of elation in some people. Used often enough, it can cause a person to become overly talkative, lively and ecstatic.
- As a depressant, marijuana has the opposite effect on some people, acting like a mild sedative, making a person drowsy and overly relaxed. Others retreat by becoming silent and withdrawn. In cases such as this, marijuana is called the “chill-out” drug.
- As a hallucinogen, marijuana makes everything around the user distorted, with heightened sounds and colors while seeming to slow the passage of time.
Forms and Routes of Administration
The different parts of the marijuana plant produce different forms of the drug that are likewise used or administered in a variety of ways.
Hash/Hashish – it is a potent and concentrated form of marijuana and contains high levels of THC. It comes from the dried resin from the flowers of the female plant and compressed into black/brown bars, cakes, sticks, balls etc. Hash is either smoked by breaking pieces off and placing in a pipe, or eaten by mixing with foods like the “hash cake” or brownies.
Cannabis oil/Hash oil – this is a less common form of marijuana but is the strongest form available, much more potent than hash or marijuana (herbal cannabis) with a high THC content. High quality oil is dark red or gold like honey. It is produced from the resin of the plant and extracted thru the use of solvents. To use, either add a drop of the oil to a cigarette and smoke; or inhaling its vapors; or by adding it to food.
Herbal cannabis (marijuana) – This is the form most people are familiar with. It is the dried leaves, flowers and sometimes seeds of the female plant, much like dried herbs. This is not as potent as either the hash oil or the hash. To use, it is smoked like a cigarette by adding to tobacco; or rolled in rolling paper on its own; or by using a pipe, blunt or a bong. It may also be added to food or made into a tea.
Street Names for Marijuana
Marijuana is fondly called by any of the following names:
- Mary Jane
- Wacky tobacky
Effects of Marijuana
Anandamide is a cannabinoid that we naturally produce in our brains. It acts as a neurotransmitter by sending chemical messages between neurons all over the nervous system. Anandamide regulates our sleep, the senses, thinking processes, mood, appetite, coordination, movement, memory and time perception.
The THC in marijuana resembles anandamide. Because of this resemblance, THC is able to attach itself to cannabinoid receptors on neurons in the areas that affect the functions listed above and activate them. This causes a disruption of various physical and mental functions.
Short-Term Effects of Marijuana
Within minutes of using marijuana, the short-term effects begin to manifest. These effects are short-lived, lasting for an average of some 30 minutes. Chasing the “high” drives users to continue using to prolong or recapture the euphoria. Other short-term side effects may include:
- Altered perception of space and time
- Altered sleep
- Decreased concentration
- Elevated heart rate
- Enhanced appetite
- Impaired motor control
- Lack of coordination and muscle strength
- Laughter, talkativeness
- Reduced alertness
- Reduces anxiety
- Reduces pain
- Short-term memory impairment
- Slurred speech
Long-Term Effects of Marijuana
When long-term use leads to addiction, familial relationships suffer, recreational activities decrease or stop altogether, school and work activities are affected negatively and production and performance are compromised. Specific long-term effects may include:
- Decreased growth of epithelial cells in lung tissue
- Elevated heart rate and increased risk of heart attack
- Increased anxiety
- Lung damage (chronic bronchitis, increased risk of lung cancer, lung irritation from exposure to carcinogens and other toxins found in marijuana)
- Palpitations and arrhythmias
When a long-term regular user momentarily stops even for a day, withdrawal symptoms may appear and worsen within 2-3 days, eventually going away in a week or two.
- Decreased Appetite
- Drug Cravings
There is actually very little information about marijuana addiction because there have been no structured studies about it. It is actually a big controversy whether marijuana does indeed cause addiction. Some sectors, however, believe that when a person feels the need to use marijuana just to feel normal, that person may be considered marijuana dependent. The following are the symptoms of a possible marijuana addiction:
- Tolerance – when a person needs more of it to feel the same effects, that person is considered tolerant.
- Withdrawal – when a person abstains from using marijuana, that person may become irritable, have trouble sleeping and become depressed.
- Unsuccessful attempts to stop using despite a persistent desire to do so.
- Extra efforts – spending too much time obtaining the drug and using it, and taking a long time to recover from its use
- Deteriorating social life – preferring to spend time indulging in marijuana instead of going out with friends.
- No desire to stop – continues using even if aware of the problems it causes.
Marijuana users and abusers put themselves at higher risk of the health problems associated with it, like mental health problems, memory impairment, respiratory diseases, etc. Dependence also leads to financial, familial, social and professional problems. Those who are employed contribute to the overall costs and safety issues brought on by marijuana use in the workplace.
Marijuana use is so prevalent that it is actually one of the so-called SAMHSA-5 or the minimum standard for most employee drug testing programs. It means a basic 5-panel drug test that checks for:
- Amphetamines (Amphetamines, Speed, Methamphetamines)
- Cannabinoids (Hash, Marijuana)
- Cocaine (Benzoylecognine, Cocaine, Crack)
- Opiates (Codeine, Opium, Heroin, Morphine)
- Phencyclidine (PCP)
History of Marijuana
- China – The earliest recorded account on cannabis use as a psychoactive agent dates back to 2737 BC as written by the Father of Chinese Medicine, the then Chinese Emperor Shen-Nung. He was a farmer and looked to plants for cures for his subjects’ many ailments. The Chinese cultivated the female plant because they realized that it produced more medicine. They used “ma” (cannabis) to treat gout, rheumatism, female weaknesses (menstruation), malaria, constipation, beri-beri and absent-mindedness. By the 2nd century A.D., Chinese surgeon Hua T’o have begun using ma for its anesthetic properties. He came up with ma-yo (cannabis-wine) as anesthesia to reduce pain during organ drafts, intestine re-sectioning, chest and loin incisions. The Chinese were aware of its intoxicating properties but they placed more importance on its medicinal uses.
- India – In India, the earliest mention of cannabis was in the sacred Hindu texts, The Vedas (2000 – 1400 BC). It is written that cannabis was one of the 5 sacred plants. They considered cannabis as a source of happiness – it is a “joy-giver” and “liberator” that helps people lose fear and anxiety. The God they frequently associated with cannabis is the God Shiva, known as the Lord of Bhang. Bhang is a drink made from cannabis leaves.
- Egypt – Ancient Egypt has documented medicinal uses for cannabis as treatment for cataracts and sore eyes as early as 2000 BC. Their women also used cannabis to relieve bad tempers, sadness and excessive menstrual bleeding. To treat hemorrhoids, they used it in suppositories. It was also used for inflammation and glaucoma. The ancient Egyptians were also the first to identify cancer as an illness and used cannabis to treat it. There is evidence that cannabis was regularly consumed because many mummified remains contained cannabis, including Pharaoh Ramses the Great (1213 BC).
- Middle East – The ancient Greeks and Roman soon became familiar with the plant, first for its use as a source of material for superior hemp, and by the 4th century BC as a remedy for backache. From there cannabis use also spread throughout the Islamic empire from the Middle East to Northern Africa, more for its euphoric properties. In the Middle East, cannabis was more commonly smoked as hashish, a compressed brick made from cannabis resin. From there, cannabis was brought to the attention of the Europeans.
- The Americas – In 1545 when the Spaniards imported cannabis to Chile for its fiber, it soon spread throughout the western hemisphere where it began to be widely grown on many plantations in North America as raw material for rope, paper and clothing. By 1890, cotton replaced hemp as the major cash crop and while a few patented medicines contained marijuana, they were far outnumbered by those that used cocaine or opium.
It was in the 1920’s during the Prohibition that marijuana began to take off for recreational uses when “marijuana clubs” or “tea pads” started sprouting like mushrooms in every major city. Marijuana clubs were tolerated because marijuana wasn’t illegal and wasn’t regarded as a social threat.
From 1850 to 1942, marijuana was listed in the U.S. Pharmacopeia for various conditions like nausea, labor pains and rheumatism. It was a popular intoxicant up until the 1930’s until the then U.S. Federal Bureau of Narcotics openly portrayed marijuana as powerfully addictive. The 1950’s saw marijuana associated with the “Beat Generation” and then became a symbol of rebellion against authorities during the “Hippie Generation” of the 1970’s.
When the Controlled Substance Act of 1970 came about, marijuana went under Schedule I drugs, right alongside LSD and heroin. After Mexico eradicated marijuana in 1975, Colombia became the main supplier, but the intensifying government campaign against it resulted in strict laws and mandatory sentences for possession. They also made it harder to smuggle through the southern borders. Indoor cultivation soon became the trend. By the early 1990’s, an upward trend in marijuana smoking began again.
Today, medical marijuana is legal in 25 states and Washington D.C. Recreational marijuana is legal in 4 states and Washington D.C. These major changes had employers and safety managers revisiting the legalities of many of the provisions in their existing Drug Free Workplace Programs specifically as they pertain to drug testing employees for marijuana. As more states are likely to legalize marijuana soon employers, their human resource teams, safety managers and other key employees will have their work cut out for them.