Colorado participants used marijuana 20 percent more often than their identical twins in Minnesota, but legalization didn't lead to more new users, researchers noted.
so the study could compile sets of twins who live in Colorado, where recreational cannabis sales have been legal since 2014, and those who live in Minnesota, where recreational pot is still banned. All participants have been involved in CU or UM studies since they were children, according to researchers, providing the study with extended behavioral information.
"What we decided to do is to collaborate with our colleagues in Minnesota, [which] wasn't legalizing recreational use of marijuana but had very similar studies of twins and families over a long period of time, as we did," Hewitt recalls."So we both, Minnesota and Colorado, had information about individuals' self-reported use of substances as adolescents.
Zellers, Hewitt and a handful of researchers studied over 3,400 adult twins, with 707 of those being a pair where only one of the two twins was participating. Out of 1,357 complete pairs of twins, 459 pairs both lived in a legal state, 691 pairs both lived in an illegal state, and 207 twin pairs lived separately in illegal and legal states. Of those 207 pairs of twins that were separated, 111 were identical.
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