Decreased sperm quality: Researchers at University College London found that the flavoring in “vape juice" — a mixture of water, food-grade flavoring, a choice of nicotine levels or zero nicotine, and propylene glycol or vegetable glycerin — can affect sperm and greatly diminish fertility.

Does nicotine affect sperm taste?

How can tobacco and other substances affect taste? As with alcohol, tobacco, coffee, and other substances like drugs are thought to contribute to smellier sweat. As such, they may also affect your semen. Consuming any of these substances can reportedly cause the flavor to become more bitter, pungent, or sour.

Does vaping do anything to your sperm?

Lower Sperm Quality in Males

Vaping has also been known to reduce sperm quality, count, and motility in males. The lack of quality sperm production makes egg fertilization nearly impossible for couples hoping to conceive.