There are lots of of "legal" incense products on the market. However, I'm guessing you're wanting something "legal" which simulates the effects of marijuana, is that correct?
If so, I don't have an answer for you ~ and wouldn't give it to you if I did! I am not against marijuana use for people with serious medical issues (such as cancer), but draw the line at recreational use or medical use for things such as "headaches" or "back pain."
Grow up and learn to deal with life without using some sort of substance as a crutch, please.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them