They're best used as "road joints". It's pretty obvious to any passing law enforcement when you're smoking a joint or blunt while driving, but if they see you smoking something that looks exactly like a cigarette, who cares?
Whenever I go on road trips, I always buy a pack of cigarettes and stuff them full of weed. I was even pulled over one time on such a trip, the cop remarked that my car smelled of weed, and asked if he could search it. I said "Go for it". He even looked into the pack of "cigarettes" but he was none the wiser
After I got back in my car, I lit a joint, waved at the cop, then pulled away. Good times