"What's clear is that people who only smoke say one-one, two three-cigarettes per day, instead of having that risk as one twentieth compared to somebody who smokes 20 a day, it's much higher than one twentieth", Hackhaw said in an interview.
Men who smoked one cigarette per day had 46 percent of the excess risk of heart disease and 41 percent of the excess risk of stroke associated with smoking 20 cigarettes per day - much higher than the expected figure of five percent.
The review of more than 140 scientific studies was led by Professor Allan Hacksaw from the UCL Cancer Institute at University College London, and states: 'No safe level of smoking exists for cardiovascular disease.
While the percentage of adults in the United Kingdom who smoked had been falling, the proportion of people who smoked one to five cigarettes a day had been rising steadily, researchers said.
The research team looked at the risks from smoking one, five, or 20 cigarettes per day inn a trawl of studies from 1946 to 2015.
Researchers compared the effects of smoking a single cigarette to smoking 20 a day and found there wasn't a huge difference in the effects.
Smoking can cause a drastic detrimental effect on your health, affecting many elements of the body including your circulation, your heart, your brain, your lungs and your fertility.
Smokers need to quit cigarettes rather than cut back on them to significantly lower their risk of heart disease and stroke, a large BMJ study suggests.
Women's heart disease risk was more than doubled with one cigarette per day, according to one analysis in the research. The investigators estimated that cigarette smoking or only one cigarette per day will be correlated with approximately 5% of the surplus relative probability of cigarette smoking.
'This probably comes as a surprise to many people.
For women, it was higher - 57% for heart disease and 31% for stroke. "There is no safe level of smoking".
But he said it was wrong to conclude cutting down smoking was useless. Only complete cessation is protective and should be emphasised by all prevention measures and policies'.