A nurse is assessing a male client regarding fertility concerns. Which statement about past behaviors is most relevant?

The statement about smoking heavily contributing to infertility is relevant because numerous studies have shown that smoking can adversely impact male fertility. Smoking has been linked to reduced sperm count, decreased motility (the ability of sperm to move effectively), and increased sperm abnormalities. These factors significantly affect a man's ability to conceive a child, making this information crucial when assessing fertility concerns.

In contrast, the other statements suggest misconceptions about their respective impacts on fertility. Long-term alcohol use is actually known to negatively influence reproductive health, and there's substantial evidence indicating that high levels of stress can disrupt hormone levels, thereby affecting sperm production. Additionally, obesity is associated with hormonal imbalances and poor reproductive health outcomes, further highlighting the importance of lifestyle factors in fertility assessments.