Ecstacy is a common misspelling of ecstasy. It's used in cases when people want to associate the happy effects of MDMA with a product without pretending to actually sell drugs, usually by companies in the "herbal" products industry for things such as "Liquid Ecstacy" and "Ecstacy Cigarettes".
The Ecstacy-branded cigarettes are a little odd. They do not contain MDMA nor even tobacco. Instead, they have a mixture of damiana, wild "opium" lettuce, catnip, peppermint, and passion flower. They're often sold on web sites specializing in "100% LEGAL WEED SMOKES" and "HERBAL ECSTASY PRODUCTS TO ENHANCE YOUR LOVE LIFE", which has made me a little wary of trying them. I'm told they smell quite a bit like marijuana while burning. | 
