Are candles cancerous?

A 2014 study tested candle emissions and found that candles don't release enough chemicals to be carcinogenic under normal use.

Read more

Keeping this in consideration, what are the healthiest candles to burn?

Beeswax candles are the healthiest choice in candles. Made from the caps of bee honeycombs, beeswax candles burn clean, are very long-burning, and give off a pleasant natural fragrance as they burn. Beeswax candles are dripless when burned properly, and release negative ions which help clean the air in a room. One may also ask can candles cause ghosting? We have several sources of combustion in our homes including our furnace, stove, fireplace, or burning candles. Any of these may contribute to ghosting if they burn their fuel inefficiently, but if we were to rank these potential soot sources, the most likely culprits are burning candles and gas fireplaces.

Regarding this, can a dirty fuel filter cause black smoke?

Dirty air filter. Black smoke indicates that the fuel is not burned properly. The ratio of fuel and air should be proper, otherwise, the mixture will be too rich, which will result in black smoke. What is black smoke called? Soot Soot, which appears as black smoke.

What are the signs of smoke inhalation?

Symptoms of smoke inhalation include: Difficulty breathing. Noisy breathing. Wheezing. Hoarse voice, trouble speaking, or inability to speak in full sentences. Cough. Dark-colored mucus from the nose or mouth. Change in mental state, such as restlessness, agitation, confusion, or sleepiness (lethargy). Keeping this in consideration, what causes thick black smoke? Thick, black smoke indicates heavy fuels that are not being fully consumed. At times, black smoke can be an indicator that a manmade material is burning such as tires, vehicles or a structure. As a general rule, the darker the smoke, the more volatile the fire is.