Following the scientific revelations of the mid-20th century , tobacco became condemned as a health hazard .
Following the scientific revelations of the mid-20th century , tobacco eventually became encompassed as a cause for cancer , as well as other respiratory and circulatory diseases .
Following the scientific revelations of the mid-20th century , tobacco became condemned as a health hazard , and eventually became encompassed as a cause for cancer , as well as other respiratory and circulatory diseases .