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Short-term use of the drug impairs thinking and coordination.
In long-term studies, teens who smoke marijuana have lower IQs later on, as well as structural differences in their brains, though scientists debate whether this is an effect of the drug or a result of habitual pot smokers seeking out less intellectually stimulating pursuits.
"Mexicans were frequently blamed for smoking marijuana, property crimes, seducing children and engaging in murderous sprees." Americans laws never recognized the difference between .
The plant was first outlawed in Utah in 1915, and by 1931 it was illegal in 29 states, according to the report.
It arrived in the southwest United States from Mexico, with immigrants fleeing that country during the Mexican Revolution of 1910-1911.
"Many early prejudices against marijuana were thinly veiled racist fears of its smokers, often promulgated by reactionary newspapers," Warf wrote in his report.
C., and some of the tombs of noble people buried in Xinjiang region of China and Siberia around 2500 B. have included large quantities of mummified psychoactive marijuana.
THC binds to cannabinoid receptors throughout the body, and marijuana's "high" comes from THC's binding to brain regions responsible for pleasure, time perception and pain, according to the National Institute on Drug Abuse (NIDA).
For example, research suggests that THC may be able to improve memory according to a 2016 study on mice.
More than half of the United States has legalized marijuana for medical use.
The amount of THC in marijuana has grown over the past few decades.
In the early 1990s, the average THC content in marijuana was about 3.74 percent in the early 1990s and in 2013 it was almost 10 percent, according to NIDA.