Easier access to more powerful forms of marijuana from states that have legalized the addictive drug is having a negative impact on an increasing number of Iowans, according to Steve Lukan, director of the Governor’s Office of Drug Control. The office released its 2017 Iowa Drug Control Strategy report Thursday. Among Iowa juveniles in substance use disorder treatment in 2016, a record 76 percent cited marijuana as their primary drug of abuse, according to the report. Additionally, the number of marijuana-related emergency department visits reported in Iowa in 2015 rose to an average of 166 per month, the most in recent history and four times more than 10 years ago. Also, the number of Iowa traffic fatalities reportedly involving drugs or a combination of drugs and alcohol reached 56 in 2015, the highest level in a decade. Traffic fatality drug types are not reported, but marijuana is the most-used illicit drug in Iowa. The report also cites data showing that use of heroin and other illicit opioids is spreading statewide, fueled by prescription opioid misuse and addiction, even as the use of purer methamphetamine and more potent forms of marijuana remains strong.