Picking up on Jim's train of thought: I smoke 7-inch cigars 8 feet away from my adeniums, 2 or 3 times/week when time allows. There is nothing I like more than generating a large greyish-blue cloud that slowly drifts away from me on days where the wind is basically calm. The philodendrons, the anthuriums, the orchids and the adeniums have never shown any sign of distress associated with my guilty pleasure. I am not trying to turn this thread into a pro-smoking forum, but my nicotine fumes seem to have as much influence on the health of my plants as does the position of Saturn relative to the moon.
Let's just face it: adeniums are temperamental divas and drama queens. I have learned to live with it. When one of mine decides to drop all its leaves, I encourage it to drop everything, up to the last leaf. Then, when it realizes it gives me no grief, it quickly sprouts new leaves and carries on. Gotta love adeniums - and cigar smokers.
Take care, all.
Sylvain.