Scented candles are a great way to spruce things up at home. But there may be health risks, based on the candle you choose.

The primary concern: candles made from a byproduct sourced from a refinement of petroleum called paraffin. The National Candle Association says paraffin is the most used candle wax in the world.

A paraffin candle releases volatile organic compounds, also known as V-O-Cs, that quickly vaporize into the air at room temperature. These compounds are commonly emitted from paints, cleaning products, car exhaust, and fuel-burning appliances like gas stoves, among other things.

VOCs are harmful on their own and react to gases to form pollutants in the air.

Toluene and benzene are two VOCs released from paraffin candles. Toluene [tall-you-een] is a registered toxin with exposure limits because it’s a neurotoxin associated with dizziness and headaches. Benzene is a known carcinogen with long-term exposure linked to blood disorders such as leukemia.

Research shows that candles made from soy wax, beeswax, coconut oil, or animal fats are considered healthier. But anything that is burned emits harmful particulates or chemicals — it’s just that paraffin wax is more polluting.

Experts say there are several ways you can minimize health ramifications. Choose candles labeled as 100% soy wax, beeswax, or stearin [steer-in] wax, and ensure the wick is cotton, wood, or synthetic. If you can’t resist scented candles, look for those with essential oils or candles labeled as phthalate-free. It’s also important to avoid dyed candles.

These precautions will go a long way in keeping your room as fresh as it is healthy.