What happens if you trap smoke in a candle?

It will extinguish the flame, BUT, it also will cause a lot of stinky black smoke. The black smoke will permeate the melted wax that has all of that lovely fragrance. The next time you light the candle it will smell bad. The wick will pop right back and be ready to light.

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Why is it better to snuff out a candle?

By putting out your candle carefully, you'll avoid a burnt, smoke-scented room that takes away from the mood you so carefully created by lighting your candle. You'll add more time to linger and enjoy those special candle moments. What happens if you burn a candle too low? Even if a fire doesn't ignite, the low-level of wax in the jar increases the likelihood of the flame brushing against the sides and the bottom. If the glass gets hot enough, it could shatter. In any case, if you let the wax burn lower than half an inch, you are putting your home at risk.

Then, why do candles have memory?

Candle wax has a memory. This means that your candle remembers where it is burnt up to on that first burn and will only ever burn up to the point it was last extinguished. This is why the first burn is the most important. If you do not let your candle burn all the way to the edges, then a memory ring will form. Consequently, can candles cause black stuff in nose? Tests have confirmed, however, it is very possible decorative scented candles are a primary culprit. Research indicates increased BSD is often the result of candle manufacturers adding additional fragrance oils to their products, along with improper wick trimming by customers.

Keeping this in consideration, can i burn a candle with my door closed?

You should never leave the candle burning in a room that is fully closed off. If a candle is left burning in an enclosed space, there will be enough carbon monoxide built up in the room to potentially cause some serious health issues.