you can't full-on legally in this country. but in some areas of my city and shit, around here, you can. without anybody either caring, or without any authority around. i smoke joints and walk down the side of the road sometimes outside my house. i live in private property, too. so i could technically smoke a blunt while standing on my land and have a cop see me, and ask me what i'm smoking, and i can say a cigar and walk off without him stopping me. he can't cross over.