This is important, because one of the objections to marijuana is that, when burned, its smoke contains many of the harmful things found in tobacco smoke, such as carcinogenic tar, cyanide and carbon monoxide.

• 这非常重要，因为反对大麻的理由之一是它燃烧时产生的烟气中包含许多在香烟烟气中发现的有害物质，比如致癌的焦油、氰化物和一氧化碳。