Pubdate: Mon, 29 Aug 2016 Source: Toronto Star (CN ON) Page: E5 Copyright: 2016 The Toronto Star Contact: http://www.thestar.com/ Details: http://www.mapinc.org/media/456 Author: Dr. Harold Kalant Note: Dr. Harold Kalant is a professor emeritus of the University of Toronto's Department of Pharmacology & Toxicology. Doctors' Notes is a weekly column by members of the U of T Faculty of Medicine. WHY LEGALIZING MARIJUANA IS THE WRONG THING TO DO Decriminalize, but Keep in Mind the Drug's Effect on Kids The federal government is planning to legalize marijuana, making it akin to alcohol and tobacco - a legal but regulated substance that's kept away from youth. The Task Force on Marijuana Legalization and Regulation is asking for your opinion on the best way to do this, and Monday is the last day to give your input. I've studied the effects of drugs on health for many years - as well as how drug policy decisions affect use. And I think legalizing marijuana now will be bad for our kids' health. Legalization is reasonable in theory, but if you take a closer look - both at our failure to curb underaged drinking and at early findings about marijuana use in places where it's been legalized - it raises troubling questions. First of all, alcohol regulation is not the most reassuring model. Our attempts to prohibit underage drinking have been far from successful. A recent study found that 74 per cent of Grade 12 students in Ontario report drinking alcohol in the past year - and 20 per cent reported binge-drinking in the past month. Just as we haven't figured out how to stop kids from drinking alcohol, we don't yet know how to deter them from smoking pot. One thing that has been shown to help, however, is attitudes based on accurate knowledge about its health effects. Kids who are aware of health risks tend to avoid marijuana. It being illegal also seems to deter at least some people. While we can't make any definitive conclusions yet, early figures in Colorado suggest marijuana use has gone up substantially after legalization. But it hasn't gone up in places such as Australia, Portugal and certain states, where marijuana has been decriminalized but not legalized. This seems to show that most people are influenced by the fact that society deems the drug to be unsafe. We have to remember that medical use and non-medical use are really separate issues. Yes, marijuana has some medicinal properties, such as relief of pain, nausea and vomiting, and it has a legitimate place in health care - just as opiates, stimulants and many other drugs do. It can continue to be used as a prescription drug, even if we don't legalize non-medical use until we know how to keep it out of the hands of kids and teenagers. One of the most disturbing effects of marijuana is its actions on kids' developing brains. In a major study in New Zealand, researchers followed over 1,000 newborns through childhood, adolescence and into middle age. Those who started smoking marijuana early, at around 12 years old, and continued the habit into their adult years had a decreased IQ later in life. The same effect was not found for those who started using the drug as adults. We've found similar results in experimental studies in the lab. Cannabis prevents nerve pathways from maturing in areas of the brain known to be involved in "executive functioning." This maturing process occurs in adolescent years, and helps with planning, reasoning, problem solving and decision-making. In the New Zealand study, this was reflected among the early users in poor school performance, higher dropout rates and reduced career achievement - even when controlled for socioeconomic status and other potential confounding factors. To me, this is the most worrisome risk of marijuana. We can still use and study marijuana as medication. We can decriminalize possession, to reduce the social harm suffered by those convicted for possession, while watching carefully what happens in places that have already legalized. The government would stand to benefit from increased tax revenue by legalizing sale. But if legalization threatens to increase marijuana use among adolescents, the group most at risk of long-term harm, that should give us pause. To find out more about the government's plans to legalize marijuana and to give your input (the deadline is Monday), go to bit.ly/297HjGD. - --- MAP posted-by: Jay Bergstrom