"What is too much? Should you be allowed to drive after a hit of pot? Or three?"

"Is a hit the equivalent of a glass of wine or half a bottle of vodka? What about when a bit of pot is combined with a beer or two? How does a police officer judge the sobriety of a person who is high? Right now, people mostly just guess... It is a strange country that is filled with people who object to life-saving vaccines, insist on labelling G.M.O.s, protest the use of pesticides that, when used correctly, have not been shown to cause harm, and yet seem ready to smoke whatever a dealer hands them to put in their pipes."

From a (subscription-only) New Yorker piece titled "What Are We Smoking?"