What is harm reduction?

One could argue that the best way to reduce and prevent harms from substance use is for everyone to stop using psychoactive substances. Similarly, one could argue that the best way to eliminate traffic fatalities and injuries is for everyone to stop driving. Rather, we adopt harm reduction strategies like seat belts, encourage people to obey road signs and not to drink and drive. When I ride my bike, I wear a helmet as that has been shown to prevent injuries. Shouldn’t everyone have access to evidence based strategies that reduce harms related to licit and illicit substance use?  The Supreme Court of Canada definitely thinks so. In 2011 they granted Insite, North America’s first and only supervised injection site, an immediate exemption from federal drug laws, upholding BC Supreme Court decision that supervised injection is a health care service.

Harm reduction is a respectful nonjudgmental approach to reducing harms of drug and alcohol use that meets people “where they are at,” in relation to substance use without the expectation of eliminating or reducing use. The goal is to reduce harm, both for the individual using a substance and for those influenced by other people’s use.  Harm reduction philosophy and principles stem from a pragmatic understanding that substance use is a feature of human existence – it is a part of our world and we can work to minimize its harmful effects rather than simply ignore or condemn them (see www.ihra.net). Participation and social inclusion of people who use substances in harm reduction responses are important  principles of harm reduction.  Within an overall philosophy of harm reduction, there is a wide range of evidence based harm reductions strategies that reduce the harms of alcohol, tobacco and illicit drugs such as heroin, cocaine and crack. 

Much of the focus in harm reduction has been on reducing the harms of illicit drug use such as blood borne diseases, overdoses, public disorder and crime.  For example, strategies like the provision of clean injection supplies or safer crack use kits, supervised injection, naloxone, methadone maintenance, and heroin prescription programs have been shown to reduce these harms especially among disadvantaged populations .  Street based harm reduction services often emphasize the importance of a trusting relationship with clients to reduce stigma and to increase referrals and access to other health, housing and social services.

We sometimes hear the argument that restricting or prohibiting the establishment of harm reduction services will reduce harm to the community and is therefore harm reduction. But this is often based on fear or misinformation rather than evidence.   Harm reduction services reduce harms by their presence not their absence.  Illicit drug use is often feared and highly stigmatized with incarceration as a response; treating substance use as a criminal rather than health issue. This is why many are calling for drug policy reform and the decriminalization of currently illegal drugs..

Providing information and education about safer use of drugs and alcohol is also part of a harm reduction approach (e.g. safe use of prescription drugs, safer drinking guidelines or safer injection techniques). Harm reduction strategies are part of public health, substance use and treatment services complementing withdrawal and abstinence based approaches.  So why are some harm reduction strategies seen as more controversial than others even though there is a strong evidence base?   Societal understanding of harm reduction is expanding and more work is being done on alcohol harm reduction and harm reduction approaches tailored to youth and women. Get ready for future blogs that address these and other issues.

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Author: Bernie Pauly RN, Ph.D, Associate Professor, School of Nursing, Scientist, Centre for Addictions Research of BC, bpauly@uvic.ca

Driving under the influence of cannabis

Attitudes toward driving under the influence of cannabis vary greatly. Some individuals claim that driving under the influence is extremely dangerous; whereas others suggest that cannabis is a fairly innocuous substance that does not increase your risk of collisions.  Research indicates that the true answer is somewhere between these two extremes. Comparisons between studies of alcohol intoxication and collision risk versus studies of cannabis intoxication and collision risk show that alcohol has more detrimental effects on driving than cannabis has on driving. Conversely, some research has shown that drivers under the influence of high levels of cannabis attempt to compensate for their condition by driving slowly and cautiously. However, while compensation can help reduce the risks of collision, these risks are not fully eliminated.

A recent review of the evidence showed that cannabis doubled the likelihood of a collision, which would be similar to the likelihood of collision from having a blood alcohol content (BAC) of .05%, the legal alcohol limit in most Canadian provinces.  For comparison, heavy alcohol intoxication to a BAC of .20% alcohol is related to over an 80 fold increased likelihood of a collision. Cannabis affects your attention span making it harder to concentrate on driving and makes it difficult to shift attention to deal with changes in the environment. Evidence suggests cannabis may also impair tracking ability (i.e., harder to follow your lane), and sense of time and distance.  The duration of impairment from cannabis lasts on average about 90 minutes, but it is best not to drive within 4 hours after smoking cannabis.

It is a criminal offense to drive under the influence of cannabis, however, nearly half a million Canadians admitted to driving within two hours of using marijuana or hashish in 2006 and youth report driving after cannabis more than after alcohol (40% vs. 20%). If a police officer suspects that you are driving while under the influence of cannabis, you can be sent to the police station for examination of impairment by a drug recognition expert, and possibly be asked to provide a biological specimen, such as urine or blood for analysis. This process is time consuming and cumbersome for the police. Some countries have dealt with the issue by implementing roadside saliva testing – a test that can detect the use of cannabis over the past few days. For example, Australia has a zero tolerance policy for driving under the influence of cannabis and uses roadside saliva tests to assess for the presence of THC. However, saliva and urine tests are not as effective at detecting impairment compared with the Breathalyzer test used for alcohol, where increased blood alcohol concentration corresponds closely with safety risk. That is, a person who tests positive for cannabis on a saliva or urine test may not be under the influence at the time of the test and therefore their driving may not be impaired. Another more accurate option for detecting cannabis impairment is the use of blood tests, currently being used in Germany, however these tests are also more intrusive and difficult to implement at roadside.

Driving under the influence of cannabis is a serious public health concern and with the recent legalization of cannabis in Washington State and Colorado and the continued movement towards decriminalization of cannabis in BC, cannabis related driving policies will be an important component of any regulatory system. 

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Authors: Scott MacDonald, Assistant Director, CARBC, and Chantele Joordens, Research Associate, CARBC