As of July 1, 2019, remote sales of e-cigarettes are prohibited in Estonia. According to Estonian legislation, buyers can only purchase e-cigarettes in person from a physical store or place an order on a website and collect it from the store themselves.

As of July 1, 2020, the sale of flavored e-liquids is prohibited in Estonia in accordance with changes in legislation aimed at regulating the electronic cigarette market. As a result, only tobacco and menthol flavors are available for sale.

The officially established maximum amount of e-liquid allowed to be brought across the border of Estonia for personal use is 20 ml. However, when entering from EU countries, up to 50ml is allowed.

In most cases, it is allowed to bring an electronic cigarette and e-liquid in carry-on luggage on a plane, but there are certain restrictions and rules that must be followed.

Rules and restrictions may vary depending on the airline and country, so it is necessary to check the requirements of the specific carrier before traveling.

In general, the following rules may apply:

1. Electronic cigarettes can only be carried in hand luggage, it is prohibited to transport them in checked baggage.
2. E-liquid for refilling can be brought on board the airplane, but in limited quantities. Usually, this is no more than 100ml per bottle, and all bottles must fit into one transparent, airtight plastic bag with a maximum volume of 1 liter.
3. The liquid must be packaged in special containers (bottles) with a secure lid and gradation in "ml" or marked capacity to avoid leakage during the flight.
4. Most airlines prohibit the use of electronic cigarettes on board the plane, including their use in bathrooms.
5. In some countries, such as Thailand, Singapore, and Brazil, electronic cigarettes and their liquids may be prohibited, and their importation may result in fines or confiscation.

Overall, to avoid problems, it is recommended to familiarize yourself with the rules and restrictions of the specific airline and country of travel and to follow these rules when packing and transporting electronic cigarettes and their liquid.

Since January 1, 2017, vaping products have been included in the Tobacco Products Directive, a European law that regulates the sale of electronic liquids. The law has two restrictions:

• No e-liquid with a volume greater than 10ml can contain nicotine.
• No e-liquid can contain more than 20 mg/ml of nicotine.

To clarify, it is not possible to find e-liquid with nicotine content greater than 10ml in Europe, and we can only use a maximum of 20 mg/ml of nicotine.