I have been vapping for 3 days now and i have a ego passthrough with ry1 and a ego XL with cappuccino in it. Both have XL carts and attys. The first day I got it, the cappuccino was very harsh and would make me cough but had a good flavor and the ry1 was smooth and taste great . Over the last 3 day the cappuccino is getting more harsh. It almost feels and taste like ash in the back of my throat. I have yet to finish a cart and was wondering if the e-liquid can go rancid after a few days. Should I clean it out and start over. Over all everything else seems to be working like it should so I not sure what icould be causing this