Scientists have found that high-density lipoprotein (HDL) has a preventive effect on heart disease  People who smoke more than 20 cigarettes a day have significantly lower levels of HDL  If you stop smoking, the content will increase  HDL content is the highest in thin people and the lowest in obese people
In men, the content of HDL decreases in their forties, on the contrary, in women, the content of HDL in elderly women is higher than that in elderly men
Male smokers are more likely to have heart disease than women