The new studies that show new, ominous sounding but nebulous effect of Marijuana use are beginning to appear. They always appear whenever Marijuana laws are being relaxed. The same thing happened in the UK a few years back when the police said they would no longer actively pursue arrests of Marijuana users. These studies are to be ignored. Legalization and governmental control of who can purchase and grow Marijuana are both enlightened and necessary to move forward. The anti-drug laws and their deleterious effects on individuals and society must first be eliminated before their past effects can be reversed. Legalize and then empty the prisons of those jailed exclusively for possession, use, and sale of Marijuana. Make it illegal for companies to test and discipline/fire their employees for substances found that have been confiscated from their employees' bodily fluids. This needs to be the real deal, otherwise it will be reversed in a heartbeat.
They shouldn't be ignored. There's a possibility it could be true. The research needs to be duplicated, many times by more than 1 research team. Only then will the credibility be challenged, confirmed or refuted. We needs lots of testing. Personal experience isn't a valid test.