They have to say "not for human consumption" for legal reasons. I suspect there's not a single person using it for incense.

Many people have trouble getting a good effect from Salvia. To answer your
first question, I find the time of day doesn't matter so much - though an hour before you go to bed would seem a reasonable strategy.

As always, my advice is to go to www.sagewisdom.org. Read the users guide and read the link related to "getting effects from smoked salvia".

I use a standardized 20X extract that's gauranteed to have 72 mg of salvinorin A per gram of fortified leaf material. This is plenty enough to have a breakthrough effect on one big hit. Smoking bad product or smoking it like pot will not yield results. You need to take a lot in very quickly as your body metabolizes it very quickly.

PM me if you want to know where I have purched from - as I tend to stay clear of anything which might be deemed an advertisement in the general postings.