I must admit I feel like my Vauen Auenland Balbor, magnificently long-stemmed thing, does always give me cool smokes. I have never gotten a bite when smoking it. But then, I must admit as well that it may just be a placebo effect...
On the other hand, it feels to me that I need to draw more energetically to get any air sucked in when smoking churchwardens, and being a friend of long, slow draws I just tend to draw extremely slow with those, so that maybe an explanation of smokes not getting too agressive.