Once flint and butane come together to create a flame, the combustion suggests that the butane won't survive beyond the fire. Which means that the butane in the lighter wouldn't affect the taste of the marijuana. The production of hemp wick is much easier on the planet than the production of plastic lighters, and smoking with a hemp wick does not generate carbon emissions. Even if you buy hemp wick online and pay more to have it shipped to you quickly, you can save money by buying hemp wick compared to what you spend on lighters.
This is because hemp burns at different rates depending on its composition, so even two threads from the same brand of hemp yarn may not be exactly the same. Car lighters can help you light hemp joints, joints, or wicks, but they're not designed for anything else.