|Perhaps but ...|
did you ask, are there some common lifestyle factors associated with poor sperm morphology?
Common lifestyle choices make little contribution - except, surprisingly, cannabis affects to quality of sperm - to the risk of poor sperm morphology.
Risk factors for poor sperm morphology, after adjustment for centre and other risk factors, included: (i) sample production in summer [odds ratio (OR) = 1.99, 95% confidence interval (CI) 1.43–2.72]; and (ii) use of cannabis in the 3 months prior to sample collection in men aged ≤30 years.Please, stop all smoking.
With the exception of cannabis there's no forth significant association was found with body mass index, type of underwear, (tobacco) smoking or alcohol consumption or having a history of mumps.
Although the power of the study was sufficient to draw conclusions about common lifestyle choices, this is not the case for exposures that were rare or poorly reported.