海角大神

Yesterday, for the first time, residents of Colorado were able to walk into a store and legally purchase marijuana without a prescription. While the nation eyes Colorado to see how legalization will affect traffic accident rates, tax revenues, and crime, parents in every state are probably going to have to field some new arguments from teens about the dangers of marijuana use.

鈥淭he word 鈥榣egal鈥� does not mean 鈥榥ot harmful,鈥� and that should be every parent鈥檚 mantra when talking about it.鈥� says Jon Mattleman a mental health counselor and youth worker for the town of Needham, Mass. 鈥淚t鈥檚 really important to try to separate those two words.鈥�

Studies have shown that marijuana use during adolescence can have negative effects on cognitive development.

Even after abstaining from marijuana use for 30 days, heavy adolescent smokers exhibited 鈥渟ubtle deficits in attention, executive function, and memory,鈥� have found.

鈥淭here鈥檚 a reason why when they did legalize it, they set 21-years-old,鈥� as the minimum age for purchase, says Tim Ryan, a prevention specialist from , a global non-profit substance prevention organization based in Newton, Mass. 鈥淭here鈥檚 no evidence suggesting that marijuana is anything but not good for the developing brain.鈥�

Nevertheless, the number of teenagers partaking in marijuana does appear to be on the rise, at least partially due to a reduced perception of risk among teens who have been following the various legal debates around the country around legalization of medicinal and recreational marijuana.

In 2005, 74 percent of 8^th graders, 66 percent of 10^th graders and 58 percent of 12^th graders believe using marijuana was risky, according to the annual survey conducted by the University of Michigan for the National Institutes of Health. Last year, those numbers fell across the board, to just 61 percent of 8^th graders 47 percent of 10^th graders and 40 percent of 12^th graders.

Mr. Mattleman has also seen a reduced understanding of the risks of intoxication among the students that he works with in Needham, especially when it comes to driving under the influence.

While teens of decades past seemed to internalize the need for a designated driver, it seems that today鈥檚 definition of designated driver has shifted for many young people. Teens today tend to rely on 鈥渢he kid that has had the least amount to drink, or more typically the kid that鈥檚 smoking marijuana and not drinking,鈥� he says. 鈥淭hat has been a very sad and very frightening shift.鈥�

Nearly a quarter of teenagers surveyed by Liberty Mutual Insurance and Students Against Destructive Decisions admitted to driving while somehow intoxicated. Among teens that reported driving while under the influence of marijuana, 75 percent said that they did not believe that choice had impaired their driving in any way, and 34 percent believed that it actually improved their driving skills.

In actuality, marijuana has been found to adversely affect 鈥渄rivers鈥� attentiveness, perception of time and speed, an ability to draw on information obtained from past experiences,鈥� according to the NIH website on . 鈥淎fter alcohol, THC (delta-9-tetrahydrocannabinol), the active ingredient in marijuana, is the substance most commonly found in the blood of impaired drivers, fatally injured drivers, and motor vehicle crash victims.鈥�

As sobering as those statistics are for parents, they mean little for many teenagers who typically have a difficult time seeing themselves as vulnerable.

鈥淭eenagers are good statisticians,鈥� says Richard Gallagher, an NYU professor of child and adolescent therapy. 鈥淭hey know that most people that use substances don鈥檛 get into serious trouble. They know that most people don鈥檛 get injured鈥�. They don鈥檛 recognize that these things can happen because they end up spending more time thinking about when it doesn鈥檛 happen as opposed to when it does happen.鈥�

It鈥檚 up to parents to help teens understand risk, Dr. Gallagher says.

鈥淚 think parents should be able to say to their kids, 鈥楲ook, it is illegal in our setting, it鈥檚 illegal in all settings for it to be used under the age of 21, and there鈥檚 a reason for that. It does have an affect on you and I鈥檓 concerned that it can have an affect on your brain and what you do afterward. I think that it puts you at risk for making bad decisions and I know that it does affect you for a couple of days after you use it.鈥� 鈥�

While teens underestimate the potential risks of marijuana use, they also tend to overestimate the prevalence of use, Mr. Ryan has found.

鈥淜ids tend to think there鈥檚 a lot more marijuana use going on than there actually is. There鈥檚 a big perception problem. Although the laws are becoming more relaxed the majority of people still choose not to do it. That鈥檚 something that definitely should be part of the conversation.鈥�

However, many teens fall back on the well-worn adolescent excuse, 鈥淏ut everyone is doing it.鈥�

Mattleman, Ryan, and Gallagher encourage parents to help their teens see that in the case of marijuana, that simply isn鈥檛 true.

鈥淵es, it鈥檚 true that by 12^th grade a high percentage of kids are using, but not all the kids are doing it,鈥� Mattleman says. In fact, according to the Monitoring the Future survey, about two thirds of kids are not doing it, no matter what your kids say.