Its tough to say conclusively that nicotine was responsible for the lightning-fast change in his case, but researchers have indeed demonstrated a connection between nicotine and insulin resistance, which can lead to elevated blood sugar levels
Tozawa M, Iseki K, Iseki C, Oshiro S, Ikemiya Y, Takishita S
"He didn't like the treatment that I had sent
In addition to sperm quality, smoking can lead to other reproductive complications in men, including: Hormonal imbalances Disruptions in spermatogenesis (sperm production), sperm maturation, and function Oxidative stress, caused by an increase in reactive oxygen species (ROS), which can lead to sperm DNA damage and fragmentation A higher risk of erectile dysfunction Given these adverse effects, quitting smoking can significantly improve male fertility and increase the chances of conception