Whether you experience these effects as positive or negative or a mix of both will depend on various factors. These include your previous experience with cannabis, the amount you use, your mood at the time, or the environment in which you use the drug. Some effects of cannabis use during pregnancy that affect your child later in life include: The symptoms of using too much marijuana are similar to the typical effects like that of using marijuana, but more severe. These symptoms may include: Lead author Dr Gary Chan from UQrsquo;s National Centre for Youth Substance Use Research said the results linked regular cannabis use with negative life outcomes by age 35. According to the Centers for Disease Control and Prevention, an estimated 3 in 10 people who use cannabis have a marijuana use disorder, meaning they continue to use the substance despite the negative side effects of weed that result from the continued behavior.