Smoking could have a negative impact the size of your erection, experts have said.
Yes it's the news that no man ever wants to hear, but cigarettes could hinder your manhood.
And though every penis is different, and strictly speaking there is no 'normal' size, according to research from BJU International, the average erect penis comes in at about 5.2 inches long and has a girth of 4.6 inches
While flaccid dongs measure about 3.6 inches long, with a girth of 3.7 inches.
And according to experts, there are a number of lifestyle factors which can impact on one's tumescence - or erectile firmness, to you and me.
Though Mary Samplaski, MD, urologist and the director of male infertility at the University of Southern California, says it's hard to determine causes of male shrinkage but smoking is one which has been found to have an effect.
Experts say there are a number of factors that could affect the size of one's penis. Credit: PA
She said: "There's not really a medical tool for measuring penis shrinkage. What we do know is that smoking and age can cause a decline in testosterone production."
According to Medical News Today, cigarettes possess toxins which can damage the blood vessels in your man thing.
During a study in 1998 boffins at Boston University of Medicine examined the erect penises of 200 men and discovered that those men who were smokers were some way off from those who didn't.
The piece of research concluded that smoking inhibits blood flow to your genitals, stopping the penis from stretching.
But it' not just smoking that can see a reduction on the size of your old fella, apparently exercise is also to blame - for a short while at least.
Dr Richard Honaker, chief medical officer at Your Doctors Online said: "It all has to do with blood flow.
Scientists say smoking contain toxins which can affect the cells in the penis. Credit: PA
"When working out, the body sends blood to the muscles and joints, thus reducing the amount to the penis and scrotum."
Don't go cancelling our gym membership just yet though, as it's only temporary and in fact could have a positive impact in the long run.
Dr Samplaski advises men to exercise at least three times a week to increase their levels of testosterone, helping to remove plaque which can calcify and prevent blood vessels from stretching.
She also warns obesity is a big factor in causing a lack of size in the trouser department, as fat contains an enzyme which turns testosterone into estrogen - eventually causing erectile issues and testicular shrinkage.
Some food for thought there, fellas.
Featured Image Credit: PA