Alcohol and substance abuse
Recreational drugs including illegal drugs or the prescription drugs that people misuse can alter the way our body functions and can result in erectile dysfunction. Using these drugs can sometimes result in serious damage to nerves and blood vessels causing erection. These recreational drugs like nicotine causes a reduction in sexual desire, heroin can reduce levels of testosterone, cocaine can cause narrowing of blood vessels around your penis, and marijuana can prevent the smooth muscles in your penis to relax to let sufficient blood flow in. [4]