That may very well be true. Consider how many trees have been planted in the southwest alone. Much of southern California was nothing but desert before white men harnessed the Colorado River and made the region habitable to millions. Additionally, the fire fighting techniques white men developed has prevented countless millions of acres of trees from burning up whereas Native Americans could not save one tree from being burned.Of course, you wouldn't say what you said unless you had the numbers of trees pre-white-man and post. I look forward to seeing them.
and that there are more American Indians now then before white man arrived.
That makes sense on a couple of counts. First of all, before white men arrived the land they occupied was not known as America. But seriously, because of improvements in science and medicine it is entirely possible that the population of American Indians has increased. Again, though, I'm sure you have access to the numbers otherwise and will provide them forthwith.
He also wrote that there is no proof tobacco causes cancer.
Again, that could be true. It might be the myriad chemicals that are put into cigarettes that might be causing the cancer. Even so, I have read that cigarette smokers are LESS likely to contract certain types of cancers such as colon cancer. Unfortunately I don't remember where I read that or I would provide the link to that info so I guess you will just have to take my word for it. Additionally, not every person who smokes cigarettes contracts cancer nor does every person who contracts cancer smoke cigarettes. However, it can be safely said that every single person who contracts cancer has drunk (drank?) water at some time in his or her life so how do we know it isn't water that is causing the cancer?