Washington – Many in the US have been asking to legalise marijuana in the United States, but a lot needs to be known about its effects, especially its long-term consequences. It can cause impaired thinking, interfere with someone’s ability to learn, and impact the developing brain. Pregnant women can develop a variety of cognitive and behavioural problems in their unborn children. According to the CDC, marijuana use disorder can cause withdrawal symptoms when users try to stop, and as many as 3 in 10 people who use marijuana have the disorder.