Cannabis is a drug that comes from the sativa plant. the main active chemical in cannabis is THC (delta-0 tetrahydrocannabional). There are three main forms of cannabis: marijuana, hashish and hash oil. Marijuana is the most common and least powerful form of cannabis, consisting of the dried leaves and flowers of the plant.
Cannabis is a drug that comes from the cannabis sativa plant. There are three main forms of cannabis:
The active compound in cannabis is THC (Delta-9 tetrahydrocannabinol). The higher a plant is in THC, the stronger its effects will be. How cannabis is grown can also affect its potency. For example, indoor-grown marijuana ('skunk') can be much stronger than outdoor-grown marijuana.
Marijuana gives off a thick, pungent odour similar to grass clippings when it is dried. The smoke also gives off a distinctive smell.
The most common way of using cannabis is by smoking it. Marijuana can be rolled into cigarettes ('joints'), smoked through a pipe or water bong, or 'spotted' which involves rapidly heating small portions of cannabis with very hot surfaces, such as knives. Utensils used in this manner will soon be tarnished with distinctive heat marks.
Cannabis can also be eaten. Normally it is mixed into cake mixtures. Another way to take cannabis is by using a vaporiser. This instrument instantly heats a small portion of cannabis to an extremely high temperature, releasing the THC vapour which is then inhaled.
Cannabis is a depressant, meaning that it slows down the messages between the brain and the body. The high from smoking cannabis normally takes effect within minutes and can affect a person for about two or three hours.
There is growing evidence of links between cannabis and mental illness, such as schizophrenia. It is important to note that an actual causal relationship has yet to be established, although current research suggests that people with a predisposition to certain mental illnesses risk worsening their condition if they use cannabis.
Slang
Grass, Pot, Weed, Mull, Chronic, Dak, Hash, Smoke, Buds, Skunk, Cabbage
Short-term effects
Greater quantities of cannabis can cause unpleasant effects, including:
Long-term effects
Long-term cannabis smoking affects both mental and physical health. The mental conditions include:
The smoking of cannabis presents similar health risks to tobacco smoking. Smoke releases carcinogens that can affect the respiratory system, and the risk increases because cannabis smokers tend to inhale more deeply and hold the smoke in longer.
There is also evidence that cannabis affects a person's hormones. Regular users sometimes report a lower sex drive, irregular menstrual cycles for women and lower sperm counts in men.
Currently there is no evidence to suggest that occasional use of small amounts of cannabis causes any permanent damage.
Cannabis does have mild addictive properties. Also, people who use it regularly might develop dependency on the drug because they are used to functioning and performing certain behaviours under the influence of cannabis.
A person who suddenly withdraws from cannabis use might suffer from some physical symptoms for about a week, including anxiety, appetite loss and upset stomach. Their sleep might be disturbed for a few weeks.
It is virtually impossible to overdose on cannabis. It has been estimated that a lethal dose of cannabis is 40,000 times that which is needed to intoxicate a person. In comparison, the lethal dose ratio of alcohol is between 4:1 and 10:1.
It is illegal to grow, sell, distribute or possess cannabis in New Zealand. People can be charged under the Misuse of Drugs Act 1975. Marijuana is scheduled under Class C of the Act, and stronger forms such as Hashish and cannabis oil are scheduled under Class B.
The maximum penalty for possession of marijuana (Class C) is three months jail and/or a $500 fine. The maximum penalty for cultivating cannabis is no more than seven years imprisonment.
The maximum penalty for Class B offences (hashish, oil) is 14 years imprisonment for importation, manufacture and supply. Possession offences carry a maximum three month jail term and/or a $500 fine.
Having a conviction for drug offences can have a significant impact on a person's ability to travel overseas and apply for certain jobs.
In some cases, first offenders or when the offending is on a minor scale, a person may be offered police 'diversion'. This means that someone can avoid the court process and the likelihood of a conviction, often in return for a donation and/or approved counselling course.
It must be noted that the diversion scheme is up to the discretion of the police, and that it is not uniformly applied in some regions. A report by New Zealand's Health Select Committee in 2003 concluded that there were racial and regional inconsistencies with police diversion. In particular, this report found that Maori were discriminated against and it urged the police to examine their procedures so that greater consistency and fairness could be achieved.
Conservative estimates state that at least half of all New Zealanders have tried cannabis.
Current trends indicate that an increasing number of New Zealanders admit to having tried cannabis. Studies found about 40 percent of 15 to 45 year-olds in 1990 admitted using cannabis at some stage. This increased to 50 percent in 1998 and 52 percent in 2001.
The New Zealand Health Select Committee conducted a report into cannabis use in New Zealand, published in 2003, and concluded that the prohibition of cannabis had not prevented or reduced its use.
Most surveys show an increase both in use of marijuana and frequency of use among both men and women and across all age groups.
New Zealanders appear to prefer using cannabis at home, with surveys indicating that private residences were the most common places to use the drug. It was also shown that marijuana smoking tended to be in social circumstances, often smoked between three or four people rather than alone.
Cannabis in New Zealand is often sold in relatively small amounts. An ounce of marijuana tends to cost around $300. A 'tinny', a foil-wrapped amount containing enough cannabis for about three cigarettes or joints, costs around $20. Other amounts are often sold for $50 or $100.
The Alcohol and Public Health Research Unit's Drug Use in New Zealand National Surveys Comparison 1998 and 2001 was published in 2002 and contains the most recent analysis of cannabis use in New Zealand. Some findings included:
The Drug Foundation’s message is clear: no drug use is the safest drug use. But we realise there will be occasions when people ignore warnings and use drugs. In order to limit the harm from their drug use, we provide information about effective methods of drug harm minimisation. Such information directly benefits the person using drugs, and also protects the wider community.
There is growing evidence that cannabis use, especially long-term and heavy use, can cause significant harm to the brain and affect mental health. The safest use of cannabis is not to use it. Other than that, it is suggested that people limit their intake to occasional use only.
People who have a history of or pre-disposition to mental illness, and who use cannabis, have an increased risk of worsening their condition or illness. People with mental illness risk harm to themselves and others if they continue to use cannabis.
A vaporiser is a machine that instantly combusts the THC content of cannabis, causing much less smoke. Consequently, there are less irritants and potential carcinogens inhaled through this method of using cannabis.
Do not use cannabis and then drive or operate machinery. Cannabis impairs reaction times and hinders concentration. The risk of an accident does increase.
Smoking cannabis after drinking alcohol compounds the effects of alcohol significantly. A lightly intoxicated person after three drinks might find the effect greatly increased after smoking cannabis, making them just as intoxicated (and dangerously so) as if they had had nine drinks.
There are a number of services around New Zealand that offer counselling, support and assistance to people who are trying to cut down or stop their cannabis use. If you feel that you or anyone you know needs help, then you can call these services in strict confidence.
If you are faced with an emergency, call 111 immediately.
To talk to someone about your or someone else's drug use, call the Alcohol Drug Helpline - 0800 787 797.
You can also get contact details for your local alcohol and other drug counsellor or treatment provider by calling the helpline or by visiting www.addictionshelp.org.nz .
The scientific and clinical evidence to support the medicinal use of cannabis and cannabis-derived products is not yet overwhelming but is well-established enough to suggest that cannabis has therapeutic benefits in treating people with serious conditions.
In particular, these conditions include:
Cannabis provides a 'broad spectrum' effect. For example, for patients with HIV/AIDS-related conditions, cannabis can reduce nausea, pain and joint aches, while providing appetite stimulation and potentially reducing anxiety.
Currently, research continues into cannabis-derived medicines, such as sprays and tablets so that users can avoid the harmful effects of smoking cannabis. However, until these alternative methods become available, smoking remains the most effective form of delivery of cannabinoids.
Under present law in New Zealand, the Minister of Health has the power to authorise the medicinal use of cannabis products. There have been applications, but to date, no Minister of health has ever approved the use of medicinal cannabis.
Click here for our evidence review and policy paper on medicinal cannabis.
There is growing evidence indicating a link between cannabis and psychotic conditions.
Cannabis use, particularly heavy and frequent use, has been linked to a condition called 'cannabis psychosis'. Episodes of cannabis psychosis are characterised by delusions, confusion, memory loss and hallucinations, and could last several days.
Cannabis can also bring forward pre-existing or latent psychosis. A person who is vulnerable or pre-disposed to depression or schizophrenia might have these conditions made worse. It can also trigger a psychotic episode in someone who already has a mental illness.
An Australian study, published 2006 in the British Journal of Psychiatry, showed that the more cannabis that a person with mental illness used, the worse their condition becomes. It also found that when they suffer a relapse in psychotic conditions, they were more likely to turn to cannabis to cope.
The issue of whether cannabis leads to the use of harder, more dangerous drugs has been a controversial subject for many years. One side of the argument states that if someone uses cannabis they will begin on a path to using harder drugs.
The other side of the argument says there is no evidence of cannabis causing the use of harder drugs, and that links between cannabis and other-drug use is due to societal and legal factors, as well as a person's predisposition to risky behaviour.
A study by Otago University researcher Professor David Fergusson, published in 2006, indicated that nearly 80 percent of the 1000 15 to 25 year-old people surveyed had tried cannabis, and over 40 percent had used other illicit drugs.
This study found a clear tendency for those using cannabis to have higher usage rates of other illicit drugs, but concluded that a number of reasons could be responsible.
In other research cited by the Health Select Committee's 2003 report into cannabis use in New Zealand, it was found that people who had used cannabis more than 50 times a year were 60 times more likely to try other illicit drugs than young people who had never tried cannabis.
However, again this study did not identify one singular causal link with the Committee report concluding: "These findings suggest that cannabis, when used frequently, may be a 'gateway' drug to other illicit drug use, although whether this is a result of contact with the illegal market or an effect of cannabis use is uncertain."
A list of relevant links to further information and resources about cannabis.
www.druglibrary.org/schaffer/library/mjfaq1.htm A list of common myths and realities about the risks of smoking cannabis.
www.parliament.nz The Health Select Committee report into cannabis use in New Zealand. Contains comprehensive research summaries and different policies related to cannabis use.
www.youthlaw.co.nz A youth information service that includes health and legal information about alcohol and other drugs.
www.urge.co.nz Youthline's website containing health and safety information and guidelines for young people.
www.ndp.govt.nz New Zealand Country Report prepared for the 46th Session of the Commission on Narcotic Drugs in Vienna.
www.police.govt.nz/service/statistics/ Crime Statistics from the New Zealand police