Studies have shown that the brain, particularly the prefrontal cortex, continues developing throughout adolescence and into young adulthood.[83] The Massachusetts Institute of Technologys Young Adult Development Project explained the significance of the prefrontal cortex: The cluster of functions that center in the prefrontal cortex is sometimes called the executive suite, including calibration of risk and reward, problem-solving, prioritizing, thinking ahead, self-evaluation, long-term planning, and regulation of emotion.[84] The National Institute of Mental Health described the brain development that takes place during the teenage years: A clue to the degree of change taking place in the teen brain came from studies in which scientists did brain scans of children as they grew from early childhood through age 20

In 2012, the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) issued a newsletter stating that non-REAL IDs may continue to be used to purchase firearms so long as the provided ID satisfied the requirements under the Gun Control Act.[1] But this all changed when California enacted the Safe and Responsible Driver Act (more commonly known as AB 60)
The age limit also would apply to electronic-vapor cigarettes, and the council also approved setting a minimum $10.50-a-pack price for tobacco cigarettes and stepping up enforcement on illegal tobacco sales
I dont think its the end point
As the first step, we will develop a detailed understanding of the joint tobaccoalcohol tax policy system with relevant stakeholders, including lay members of the public