And this rising potency is a direct consequence of cannabis being illegal. Producers are breeding stronger and stronger strains with higher THC content and lower CBD to get the most bang for their buck. This is true for all illicit drugs, as they tend towards becoming more potent when they need to be smuggled (e.g. why fentanyl is often added to heroin, as it delivers more potency per gram).

If you legalise and regulate it, suddenly that pressure is taken away. Cannabis is produced in consistent and known strengths, distributed in packaging that clearly states the potency so people can make informed choices about what they take.