The strongest effect was seen in older males who had quit smoking but the vitamin E had some effect in virtually all groups. The dose was just 50mg daily, which is about 75 IU. More importantly, they used DL-α-tocopheryl acetate, which has only about 50% of the activity of alpha-tocopherol. So, even 25mg (~40 IU) of alpha tocopherol may be able to achieve the same effects.
https://www.sciencedaily.com/releases/2016/10/161005083649.htm
"...One-third of the 7,469 participants quit smoking for a period and 27 of them got pneumonia. These 27 cases of pneumonia can be used to estimate the effect of vitamin E on currently nonsmoking males. The incidence of pneumonia was 72% lower in the vitamin E participants who had quit smoking, and this benefit from vitamin E was also seen among those who smoked heavily or did not exercise."
https://www.sciencedaily.com/releases/2016/10/161005083649.htm
"...One-third of the 7,469 participants quit smoking for a period and 27 of them got pneumonia. These 27 cases of pneumonia can be used to estimate the effect of vitamin E on currently nonsmoking males. The incidence of pneumonia was 72% lower in the vitamin E participants who had quit smoking, and this benefit from vitamin E was also seen among those who smoked heavily or did not exercise."
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