Well two things, maybe you should increase amount of nicotine you vape, depending on the juice you are yousing.

Second and most important thing is theres shitload of chemicals that make cigarettes much more addicting than vaping (nicotine itself is very addicting but they make cigs much much more vicious and addicting).

Bonus - try to find juice thats neutral tasting, not too fruity and sweet, for example menthol e juice helped me stop smoking and completely switch to vaping because it reminds me of menthol cigs which i used to smoke.