WASHINGTON — The Food and Drug Administration will propose sweeping new rules on Thursday that for the first time would extend its regulatory authority from cigarettes to electronic cigarettes, popular nicotine delivery devices that have grown into a multibillion-dollar business with virtually no federal oversight or protections for American consumers.

The regulatory blueprint, with broad implications for public health, the tobacco industry and the nation’s 42 million smokers, would also cover pipe tobacco and cigars, tobacco products that have long slid under the regulatory radar and whose use has risen sharply in recent years. The new regulations would ban the sale of e-cigarettes, cigars and pipe tobacco to Americans under 18, and would require that people buying them show photo identification to prove their age, measures already mandated in a number of states.

Once finalized, the regulations will establish oversight of what has been a market free-for-all of products, including vials of liquid nicotine of varying quality and unknown provenance. It has taken the agency four years since Congress passed a major tobacco-control law in 2009 to get to this stage, and federal officials and advocates say it will take at least another year for the rules to take effect — and possibly significantly longer if affected companies sue to block them.

“If it takes more than a year to finalize this rule, the F.D.A. isn’t doing its job,” said Matthew Myers, president of the Campaign for Tobacco-Free Kids, an advocacy group.