Have many people had positive experiences adding them into the blend? are they harsh to smoke?

and do they impart a calming soothing quality to the experience, similar to when you drink them in a tea.

Just wondering..

I have, they are actually quite pleasant to smoke less harsh than a lot of other herbs.

Indeed they do have that lovely soothing relaxing quality.

A great changa additive indeed, give em a try sometime, I think you will not be disappointed