The risk of heart disease in a cigarette

If drinking 20 cigarettes of whole pack, the risk of getting heart disease and stroke is only one cigarette but almost half of them are at risk.
We think that if someone consumes one cigarette instead of 20 cigarettes a day, then only 5 percent of the risk of heart attack is on the risk.
Although it is applicable for lung cancer, it is not right to be infected with heart disease and stroke. Even after drinking just one cigarette a day, the whole packet is about half the risk of smoking.