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A small torch will burn about 300 degrees hotter than a regular lighter. The good part about this is that the torch burns all the carbon produced by the breakdown of butane. That means a torch leaves nothing for you to taste, since the leftovers-water vapor, carbon monoxide and carbon dioxide- are odorless and tasteless. The incompletely burned carbon (left by a regular lighter) is responsible for the funny taste-not butane taste, just carbon taste. So if you use nothing but a torch on your pipe/bong, there will be no aftertaste. If you use a normal butane lighter, you'll leave some carbon black, some of which will burn off later, even with a non-torch lighter. Using a torch after a regular lighter will definitely give you a taste of carbon.