Which is the MOST accurate statement about the effects of marijuana in chronic male users?

Which is the MOST accurate statement about the effects of marijuana in chronic male users?

• A. Lower sperm count in some men
• B. Infertility in most men
• C. Abnormal sperm morphology (shape and size) in some men
• D. Increases fertility in some men

Answer: (A)

Chronic marijuana use can affect male reproductive hormones, because THC can dampen the hypothalamic-pituitary-gonadal axis. This can lead to lower levels of hormones like LH and FSH, which support testosterone production and spermatogenesis. In some men, this hormonal effect translates into a lower sperm concentration. That specific, measurable impact—lower sperm count in some men—is the best-supported statement. Infertility in most men would require widespread failure of fertility, which isn’t consistently shown in the data. Abnormal sperm morphology can occur in some individuals, but the most robust and common finding across studies is a reduction in sperm count, not a universal or predominant change in morphology. There’s no evidence that marijuana increases fertility. Also, effects are often dose- and duration-dependent and may be reversible after stopping use.

Chronic marijuana use can affect male reproductive hormones, because THC can dampen the hypothalamic-pituitary-gonadal axis. This can lead to lower levels of hormones like LH and FSH, which support testosterone production and spermatogenesis. In some men, this hormonal effect translates into a lower sperm concentration. That specific, measurable impact—lower sperm count in some men—is the best-supported statement.

Infertility in most men would require widespread failure of fertility, which isn’t consistently shown in the data. Abnormal sperm morphology can occur in some individuals, but the most robust and common finding across studies is a reduction in sperm count, not a universal or predominant change in morphology. There’s no evidence that marijuana increases fertility. Also, effects are often dose- and duration-dependent and may be reversible after stopping use.