It is very easy to make your own snuff. All you need is a snuff grinder.
Crush the ready dried and cured tobacco into small pieces, removing any hard or woody bits. Place a tiny about of tobacco into the snuff grinder and give the handle a few turns.
The finely grinded tobacco snuff will fall through the fine sieve and accumulate in the chamber below.
If you want to alter the smell of the snuff, simply place it in close proximity to anything you would like the tobacco to capture the smell of, eg. mint, jasmine, etc.