It depends on the person and their circumstances.

I think the herb should be smoked when a person needs to unwind and relax for a couple of hours... have I abused it before, based on that definition? Yes. Do I think drug abuse is a good idea? No.

Certainly the physical effects of smoking "too much" are quite minimal... but I do think the herb can be abused. It's all dependent on why somebody is using it... obviously for certain medical reasons it is indicated more frequently than for recreational/health tonic purposes...

I dunno, for me, I can smoke it every night, but I don't need to. I do it more when I have stress or health problems. I think that more than once a day is abuse, for me, unless I'm sick, but for others it might be different.

Do what makes you feel good about yourself. If you feel like your drug use is standing in your way... then it's too much. If you feel like your drug use is helpful to maintaining health, then it's just right.