Maine will become the fourth state to raise the smoking age to 21 and will adopt stricter regulations on the sale of digital cigarettes after lawmakers on Wednesday voted overwhelmingly to override the governor’s veto.

Gov. Paul R. LePage, a Republican, had called the bill an attempt to “social engineer our own lives,” stating that if 18-year-olds can join the army and fight in wars, they need to be permitted to decide on their own whether to use tobacco.

Senator Paul Davis, a Republican who wrote the bill, said the governor’s remarks showed that he had missed the point of the law.

“People who join the military do not have 15-year-old kids following them around and being amazed with their activities,” Mr. Davis told reporters following the Senate’s vote on Wednesday. “It is about the availability of cigarettes in schools.

“Beginning in July, anyone under 21 won’t be allowed to purchase tobacco products in the country, which will join California, Hawaii and New Jersey as the only states to increase the age limit to 21, from 18. Maine’s new regulations will also apply to devices like e-cigarettes, which can be popular among teens; hookah pipes; and smoking accessories.

In the last two decades, tobacco usage among teenagers in Maine has dropped radically, mirroring a similar decrease throughout the country. But the state still ranks near the top for high schoolers who smoke cigarettes: In 2015, 11.2 percent of Maine high school students smoked, just above the national average of 10.8 percent, according to the latest data from the Centers for Disease Control and Prevention.

Smoking is the major cause of preventable death in america, accounting for about 20 percent of all deaths.