I'm not sure about smoothness. I think it depends on the nicotine content. Because like before I bought mine I would just smoke whatever my friends had and those were always really smooth, but then when I bought mine which is only 1.6% Nicotine it was pretty rough. I'm not sure if my friends had nicotine free or if its my vaporizer or what.FDA hasn't approved that stuff yet ( vaping ), but it is very smooth isn't it? I'm just hoping it's not any worse than cigarettes. I've heard it causes a lot of heart problems!
Also... I haven't smoked in a while but damn a joint would be nice right now. LOL