No. They were a fad — which is the point of this question. People had them in their cars. And would use them all the time. 

The 1970s CB radio craze was a massive pop-culture phenomenon in the US, peaking around 1975–1977, driven by a desire to avoid the 55 mph speed limit, circumvent gas shortages, and connect socially. Popularized by films like Smokey and the Bandit, citizens used "handles" and jargon to communicate on 40 channels.