(Thread necromancy! Hope you don't mind...)
Re: the strength of the hickory smoke powder: less relevant to sausage making but I tried it as an additive in my bourbon BBQ sauce yesterday. I had approximately 1.25 litres of sauce after reduction; aiming for only a fairly subtle smoky flavour, I measured out 1/4 of a teaspoon and was planning in adding it in four stages, testing between each addition. After the first go (so just 1/16th of a teaspoon added), a taste test suggested I was already done! It had imparted just what I wanted: a smoky background note to the taste.
I strongly suspect my 50 g bag is a lifetime's supply