Those conditions are similar to kilning tobacco. Above about 54°C, tobacco will darken in color, and acquire a stronger aroma.
One difficulty in understanding the industrial processes is that brand-name companies are being continually re-sold to other corporations, moved to different manufacturing locations in different countries, which leads to altering both the tobacco sourcing and the manufacturing processes. The only thing constant is the brand name.
The last time I used Drum tobacco was a half-century ago. I'm sure I would not recognize today's product.
I cannot clarify the chemical alterations, or name "flavors" that are often assigned to tobacco.
Bob