Changes

A study from New Zealand conducted in part by researchers at Duke University showed that people who started smoking marijuana heavily in their teens and had an ongoing marijuana use disorder lost an average of 8 IQ points between ages 13 and 38. The lost mental abilities didn't fully return in those who quit marijuana as adults. Those who started smoking marijuana as adults didn't show notable IQ declines. <ref>https://www.drugabuse.gov/publications/drugfacts/marijuana</ref>

A study from New Zealand conducted in part by researchers at Duke University showed that people who started smoking marijuana heavily in their teens and had an ongoing marijuana use disorder lost an average of 8 IQ points between ages 13 and 38. The lost mental abilities didn't fully return in those who quit marijuana as adults. Those who started smoking marijuana as adults didn't show notable IQ declines. <ref>https://www.drugabuse.gov/publications/drugfacts/marijuana</ref>

As of early 2019, only two countries have legalized recreational use of marijuana, as in 2013 socialist [[Uruguay]] legalized the drug, and [[Canada]], under Trudeau's Liberal Party, legalized marijuana in October 2018. In the United States, nine states have "legalized" the recreational use of marijuana: Alaska, California, Colorado, Oregon, Massachusetts, Maine, Nevada, Vermont and Washington, along with Washington D.C., but not all allow sales of marijuana.  All but three conservative states have either decriminalized marijuana or allowed limited medical usage for specific medical conditions. However, due to the Supremacy Clause, federal law, under which marijuana is illegal, overrules those states which have legalized or decriminalized, so their "legalization" is only de facto effective to the degree to which the federal government refrains from enforcing federal law.

As of early 2019, only two countries have legalized recreational use of marijuana, as in 2013 socialist [[Uruguay]] legalized the drug, and [[Canada]], under Trudeau's Liberal Party, legalized marijuana in October 2018. In the United States, nine states have "legalized" the recreational use of marijuana: Alaska, California, Colorado, Oregon, Massachusetts, Maine, Nevada, Vermont and Washington, along with Washington D.C., but not all allow sales of marijuana.  All but three conservative states have either decriminalized marijuana or allowed limited medical usage for specific medical conditions. However, due to the Supremacy Clause, federal law, under which marijuana is illegal, overrules those states which have legalized or decriminalized, so their "legalization" is only de facto effective to the degree to which the federal government refrains from enforcing federal law.