I enjoy candle magic. I find it very straight forward and very versatile. I don't hold much with certain superstitions attached to candle magic, however. I've always been of the opinion that the intent and level of respect is what counts. After all, if I blow the candle out, am I "blowing away" and wasting the energy, or am I sending the energy off to do my will upon my breath? Is it more rude to put out the candle with the air element (blowing it out) than it is with the earth element (using a snuffer)? Wouldn't snuffing (earth element) be like grounding, therefore dissipating the energy? See, I can create superstitions, too! :D
In terms of candle health, it's best to re-wax the wick after putting out the candle by dipping the wick into the pool of melted wax after you put it out, so that could be the origin of the superstition that the fire element and/or the spirits will be offended if you blow out the candle. If the wick is not re-waxed, then it will have no protection from any moisture that gets on the wick, and an even slightly damp wick will have difficulty being re-lit. Even heavy humidity in the air can make a wick difficult to light.
Of course, using a snuffer doesn't automatically re-wax the wick, either. Some people just smash the snuffer down onto the candle, and that can sometimes re-wax it a little, but not much and not always. Others hold the snuffer just above the flame without it touching the wax so that it burns up the oxygen under the bell and goes out, basically suffocating the flame, which to me is the same as blowing it out. Also, using a snuffer in this way creates as much or more smoke as blowing it out.
My favorite candles to use are votive candles in glass votive holders. Once the candle gets going, the wax drips into the sides, creating a mini jar candle in a way. This helps the candle last longer. When I want to put it out, I'll just take a snuffer and use the handle end, or the handle end of a spoon or fork, and put out the candle by dipping the wick straight into the melted wax. This re-waxes the wick and also keeps the candle from smoking, which I tend to be allergic to anyway. Then, I'll use the handle to make sure the wick is standing upright again so it'll dry upright and be easier to light next time. There are also specialty tools for this that you can get from some candle shops, though any long, heavy gauge wire with the last 1/2 inch bent at a 90 degree angle works just as well.
All that is harder to do with taper candles unless they are of a large diameter, but you can still kind of do it by mashing the wick down onto the top of the candle, especially once it has burned down to the wider section, or else if it's the same diameter the whole length, like the stick candles we've nicknamed "witch sticks" that you can get from most new age shops and online occult supply stores
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