I love spicy foods and would like to try some spicier e-liquids as well, but I'm hesitant since eating and inhaling are such different things... I've considered jalapeño, but I've rarely seen a jalapeño e-liquid that has good reviews. Though, to be fair, I've rarely seen it at all and I don't think many people have the guts to try it out. My understanding is that it is mostly used for mixing, to add a little heat to other flavours. I'm sure that depends on the specific liquid though.
I tried to find links to the jalapeño juices I've seen before, on the sites I usually order from, but they no longer carry them. Possibly a sign...?