So an aerosol could contain propylene glycol and glycerin, which are solvents in the e-liquid.

因此，气溶胶可能含有丙二醇和甘油，这些都是电子烟液中溶剂。

When propylene glycol and  glycerol are heated too much, they decompose and turn into harmful  molecules.

丙二醇和甘油被过度加热时，它们会分解并转化为有害分子。

The major ingredient in most vape  juice is propylene glycol and glycerol, the main chemicals in smoke machines, which  are also used in countless chemical processes.

大多数电子烟液成分是丙二醇和甘油，这两种化学物质同样广泛应用于烟雾机及众多化学工艺中。