One’s lifestyle can affect both systems. If you live a healthy lifestyle, your respiratory and circulatory system will be healthy too. The oxygen can be delivered all throughout the body. But, when you live an unhealthy lifestyle (ex. Smoking), there is a possibility that the whole circulatory or respiratory system will be damaged and can cause death to the person. 
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It affects the functioning by the way a person makes or does his daily work...... when he excercises regularly,eat nutritious foods and sleeps atleast 8hrs,he is healthy..... but if his daily routine is to drink alcoholic drinks,eat junkfoods and don't sleep in right time then he is unhealthy because of his lifestyle.....
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