A ban on the sale of vapes to under 18s takes effect from the 22nd of December.
Penalties for breaking the new rules could include fines of up to €4,000 or six months in prison.
Other measures are due to follow next year, including action on e-cigarette sales in vending machines, and advertising.
Health Minister Wicklow TD Stephen Donnelly says the legislation is important.
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Sunny intervals
High: 23°C | Low: 16°C
Sunny intervals
High: 22°C | Low: 16°C
Sunny intervals
High: 26°C | Low: 16°C
Sunny intervals
High: 26°C | Low: 16°C
Sunny intervals
High: 29°C | Low: 16°C
