There are many,many people who’ve used alcohol legally who haven’t gone on to *any* illegal drug. But knowing that you’ve broken the law by possessing grass you’re less likely to be adverse to doing something a little more illegal.’
Knowing you’ve broken the law...e.g., driving while intoxicated.
Lower BAC limits for breaking the law, you get more arrests and convictions. Being .12 on a BAC test, one is not really impaired. A 65 year old sober individual, is more impaired than a person who can blow a .12. The law making .08, is meant as a political payoff to those who give money to Democrats, and creating more profit for insurance companies, lawyers and local Judges retirement funds.