A nurse has shown the disgusting reality of what smoking a packet of 20 cigarettes a day can do to your lungs.
She has two sets of lungs on the table to demonstrate the stark differences.
The smokers lungs are black, misshaped and unable to hold in the oxygen pumped into them, while the other set are bright and able to hold the air in.
On her Facebook post nurse Amanda Eller from North Carolina, in the US said: "Cancerous, one pack per day for 20 years, versus healthy lungs.
"Still wanna smoke?"
In the video, as she blasts air into the black lungs, she said: "These lungs are COPD [Chronic Obstructive Pulmonary Disease] lungs, cancerous lungs.
"The elasticity has gone, they stretch out but the recoil of them just snaps right back because there's nothing to help hold them open."
She then demonstrates the healthier lungs and the difference is easy to see.
According to the NHS, smoking is still the biggest cause of preventable deaths in England, accounting for more than 80,000 each year.
And one in two smokers will die from a smoking-related disease.
Their website reads: "Your lungs can be very badly affected by smoking.
"Coughs, colds, wheezing and asthma are just the start.
"Smoking can cause fatal diseases such as pneumonia, emphysema and lung cancer.
"Smoking causes 84% of deaths from lung cancer and 83% of deaths from COPD."
It also states that your circulation, heart, stomach, brain, mouth, throat, skin, bones and fertility are all negtively affected by cancer.