In that 1910 article, by a Dr. George L. Meylan of Columbia University, you can see some of the early science of tobacco's health effects. He talks about animal studies showing nicotine's dangers, as well as funny comparisons of the heights and grades of smoking versus non-smoking college men. His own study wisely points out that smoking may not necessarily cause bad grades—it might be correlated with bad grades because smoking students tend to be more social, and perhaps came to college for the social benefits, rather than the scholarly ones. He ultimately comes the not-bad-nor-good conclusion quoted above, but also points out, "All scientists agreed that the use of tobacco by adolescents is injurious; parents, teachers and physicians should strive earnestly to warn youths against its use." Thanks, Dr. Meylan.