Since this topic has been revived, I'll weigh in: I've smoked numerous different plants over the years. Few blends, though, save for various things mixed with cannabis, as I was a daily cannabis smoker for some time. I no longer smoke cannabis, but smoke tobacco - just "regular" nicotiana tobacum, not the n. rustica that's found in mapacho , though I have smoked that, too, in the past (when in Peru, in and out of Ayahuasca ceremonies, and afterwards when I brought some back). I should note that I exclusively smoke brands of cigarettes that don't add other chemicals to their tobacco, as most commercial cigarette brands do. In the United States, the only brands I know of that are without additives are Dunhills (my preferred brand), American Spirits, and Nat Shermans. Having done this for so long, on the rare occasion that I've smoked, say, a Camel or Marlboro or something, it makes me very sick - headache, nausea, and after one cigarette my lungs feel like I've smoked a whole pack in one sitting. So I stick to natural stuff. Options might be better if you buy loose tobacco, but I've never been good at rolling. For a while I smoked hand-picked wild tobacco out of a pipe, but my source for that dried up pretty quickly. At any rate, even though I "just" smoke cigarettes, and even though I definitely am physically addicted to nicotine, and even though there are definitelyNow major physical consequences to regularly smoking tobacco, I do try as much as possible to treat it as the sacred substance that it is, and definitely use it magically and medicinally. As noted above, it's definitely a plant that adapts to and amplifies whatever your intentions are as you smoke it, for better or worse.
Musings about tobacco aside, as I've said, there are many other plants that I've smoked. It's been some time since I've smoked them, and at the time that I did so, it was alongside a regular cannabis habit, so even if I wasn't smoking it in a blend with cannabis, it was often difficult to distinguish all of the individual effects of the respective herbs (read: I was constantly stoned in those days). Therefore, I apologize if I'm not able to give more than a laundry list of things that I've smoked, but even that might be useful to some, so here goes. Off the top of my head, I've smoked damiana, mugwort, wormwood, hops, lavender, rose, sage (Salvia officinalis), Calea zacatechichi, Blue Lily of the Nile (Nymphea caerulea), blue lotus (Nelumbo nucifera)... as well as others, that's about all I can think of for now. And now a very brief synopsis: damiana was nice, kind of like a weird counterpoint to cannabis that at the same time wasn't like cannabis at all, and a great aphrodisiac. Mugwort is a personal favorite, but it's also a plant I work with in general, and now i consume it in ways other than smoking it for the most part. Wormwood for some reason didn't resonate with me as well as mugwort, even though other people say it's stronger, idk. Hops did absolutely nothing for me. Lavender, rose, and sage I used mostly to blend with cannabis, as on their own I just felt like there were better ways to contact those plants than by smoking them, but they'll definitely mellow out a smoking blend. Blue Lily of the Nile did nothing for me but tasted nice. Blue Lotus was amazing - so incredibly relaxing, but so clearheaded. (Yet Blue Lily and Blue Lotus share a lot of the same chemicals?)
All of that is a horrendous glossing over of plants that are far more nuanced and beautiful than that to which this post could ever do adequate justice. I've smoked other things, too (frankincense?!?) but I'll let this post serve as a starting point to anyone who stumbles upon this thread and wants more information.