I don’t get how people smoke it either. Hell, I’ve arrested dozens of people for weed possession/smoking in public. But I just don’t feel that people should be criminalized for buying it from a regulated dispensary (which takes it off the street) and smoking it in their own home or a controlled private establishment.
For traffic, there’s no breathalyzer for that in use, yet, as far as I know. During a car stop in your state, do they have anything with them or on record to show that their consumption or possession is legal? Do medicinal users have anything on record or with them?