In another recent study on twins those who used

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Those who started smoking marijuana as adults didn't show notable IQ declines. In another recent study on twins, those who used marijuana showed a significant decline in general knowledge and in verbal ability (equivalent to 4 IQ points) between the preteen years and early adulthood, but no predictable difference was found between twins when one used marijuana and the other didn't. This suggests that the IQ decline in marijuana users may be caused by something other than marijuana, such as shared familial factors (e.g., genetics, family environment). (American_journals,2011) NIDA’s Adolescent Brain Cognitive Development (ABCD) study, a major longitudinal study, is tracking a large sample of young Americans from late childhood to early adulthood to help clarify how and to what extent marijuana and other substances, alone and in combination, affect adolescent brain development. A Rise in Marijuana’s THC Levels. The amount of THC in marijuana has been increasing steadily over the past few decades. For a person who's new to marijuana use, this may mean exposure to higher THC levels with a greater chance of a harmful reaction. Higher THC levels may explain the rise in emergency room visits involving marijuana use. The popularity of edibles also increases the chance of harmful reactions. Edibles take longer to digest and produce a high. Therefore, people may consume more to feel the effects faster, leading to dangerous results. Higher THC levels may also mean a greater risk for addiction if people are regularly exposing themselves to high doses. (dragabuse.gov/marijuana,2014) Marijuana create jobs because legalizing and regulating marijuana will bring one of the nation's largest cash crops under the rule of law. It will help to improve the economy and help every person finds job. Therefore, marijuana should be legalize because this will create jobs and economic opportunities in the formal economy instead of the illicit market. Save money, scarce law enforcement resources will be better used to ensure public safety while reducing corrections
and court costs. State and local governments would acquire significant new sources of tax revenue from regulating marijuana sales. According to Doug Quenqua (2018) a specialist of CNBC.com, there are many hot careers created by legalizing marijuana like the following: Director of cultivation, they call it a weed, but growing crops of strong, healthy marijuana is both an art and a science. All grow operations, no matter how small, need a director of cultivation — also known as a master grower — to oversee planting, cloning, feeding, watering and pest management. At larger operations, cultivation directors have management responsibility for a team of growers, and the position typically requires frequent interaction with law enforcement to ensure compliance. A background in horticulture or agriculture is a must for this job, and advanced degrees in either are sometimes required. Familiarity with cannabis is preferred, but plenty of employers are happy to hire someone with experience managing a large-scale greenhouse operation.

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