But there is a reason we have controlled substances that are completely illegal, require a prescription, or are limited to those 21 and over and with additional restrictions.
The percentage of the population that is susceptible to physical addiction of chemicals, when broken down and simplified to a number, is between 15-20%. For example, I smoked cigarettes for a short while in my youth, getting to between half a pack and a pack a day then quit cold turkey. My roommates even still smoked at the time, yet I didn’t find it that hard to quit and never had any real urge to start again. Clearly it was far far easier for me than someone susceptible whom I know several and it is extremely difficult for them.
As for phone/screen use, especially with minors, I think we should at least be in the "soft side" of doing something productive/positive
The activities in the environment that are considered “addictive” is broad. Gambling is about 1-3% while things like social media can be 40-60%. And the truth is more complicated than a dice roll and binary result of true/false. However, all of these punish more than a hundred million people in the US alone for the susceptibility of some. Rather than blanket bans, focusing on scientific study, education, alerting individuals as soon as possible to their susceptibility, and treatment programs with social safety nets is more effective and maximizes freedom which is scary for some people but reality is scary and letting a government citizens have little say in dictate it is scarier still.
The reality is screen time in jobs and schooling contributes to many of us neglecting many of our physical needs and creates psychological stresses with the same general pattern. There is widespread pushback and campaigns to try and normalize it even though we don’t really have an equivalent saturation of similar activity for all human history before the Information Age to act as a guide. The percentage of the population that did equivalent reading was far far lower and it’s not 100% overlapping with screen time. Unfortunately people in charge tend to run on emotion and vibes rather than from a scientific basis, and worse still, science relies on money and monied interests fund corrupt studies to muddy the waters to suit their own ends.