I'm 21 i was a heavy smoking ,stopped smoking 3 days ago, using a vaporiser,but i'm short on breath and have a sore throat,ear ache,lump in throat.

You should stop: I'm so glad you stopped smoking and begun your journey toward better health! Unforunately, we know far to little about vapes and thus people should not be using them. I would recommend ceasing use of your vape and continue on your path of staying off tobacco products completely. You should feel better while off them!

Take Your Lumps Now: Well, what'd you expect-a new car and a hot date?No matter what physical ailment you have, smoking will not make it any better. So if you have a mild virus or a cold or cough-- you smoke,you suffer more.Three days of inhalational abstinence is not enough,especially if you were a heavy smoker.So for now, just try and not smoke and see how it goes. Later,try to cut down to at least 1/2 pack a day