Electronic cigarette

1. An electronic cigarette, comprising a sleeve and a cigarette holder cover received in the sleeve,

wherein the sleeve defines at least one inhaling hole at a side surface of an end of the sleeve near the cigarette holder cover, and the cigarette holder cover comprises a cap and a main body extending from a bottom surface of the cap; the main body defines a first groove at an outer surface thereof, the first groove is aligned with the inhaling hole of the sleeve to cooperatively form a channel configured for flowing of smoke, and the channel is configured to guide smoke in the electronic cigarette to reach the inhaling hole and inhaled by a user at a joint of the first groove and the inhaling hole;

wherein the main body further defines at least one second groove at a side of the first groove opposite to the cap, and the second groove corresponds to and communicates with the first groove; and

wherein the number of the second grooves is four, and the second grooves are spaced from each other.

2. The electronic cigarette of claim 1 , wherein the first groove is a circular groove defined at an outer surface of the main body.

3. The electronic cigarette of claim 1 , wherein the electronic cigarette further comprises a seal ring, the cigarette holder cover further comprises a first connecting portion connected with the seal ring; and the first connecting portion defines a third groove communicating with the second groove.

4. The electronic cigarette of claim 3 , wherein the first connecting portion configures a buckle, an inner surface of the sleeve defines a notch corresponding to the buckle, and the buckle and the notch cooperatively define a buckle connection.

5. The electronic cigarette of claim 3 , wherein the first connecting portion defines a notch, an inner surface of the sleeve configures a buckle corresponding to the notch, and the buckle and the notch cooperatively define a buckle connection.

6. The electronic cigarette of claim 3 , wherein the cap, the main body and the first connecting portion are integrally formed.

7. The electronic cigarette of claim 1 , wherein the inhaling hole is circular, kidney, polygonal, or elliptic shaped.

8. An electronic cigarette, comprising a sleeve and a cigarette holder cover received in the sleeve,

wherein the sleeve defines at least one inhaling hole at a side surface of an end of the sleeve near the cigarette holder cover, and the cigarette holder cover comprises a cap and a main body extending from a bottom surface of the cap; the main body defines first groove at an outer surface thereof, the first groove is aligned with the inhaling hole of the sleeve to cooperatively form a channel configured for flowing of smoke, and the channel is configured to guide smoke in the electronic cigarette to reach the inhaling hole and inhaled by a user at a joint of the first groove and the inhaling hole;

wherein the first groove is a circular groove defined at an outer surface of the main body;

wherein the electronic cigarette further comprises a seal ring, the cigarette holder cover further comprises a second connecting portion connected with the seal ring; the second connecting portion defines four gaps, each of the gaps being communicated with the first groove for the atomized smoke flowing; and

wherein the gaps are spaced from each other.

9. The electronic cigarette of claim 8 , wherein the cap, the main body and the second connecting portion are integrally formed.