With his signature, Delaware Gov. Jack Markell will make young people buying e-cigarettes illegal in the First State.
Last month the state Senate voted to outlaw the sale of electronic cigarettes to minors.
The bill treats electronic cigarettes the same as tobacco products under Delaware law, even though they contain no tobacco. More than 27 other states have similar laws.
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A business could be fined and possibly lose its license to sell tobacco products for noncompliance. Minors trying to buy e-cigarettes would be subject to fines and community service.
Lawmakers are working on separate legislation that adds electronic cigarettes to the state's indoor smoking ban.
Electronic cigarettes heat a nicotine solution to produce an odorless vapor without the smoke and tar of tobacco.
Other state lawmakers are expected to join Markell as he signs the vaping legislation Thursday afternoon.