I made the switch about 18 months ago and Five Brothers is probably not what I would choose primarily, though it may be a good option in certain situations. It has a reasonably high nicotine level, but well short of other, more interesting blends. It takes time for the nicotine to absorb via the pipe and Five Brothers burns so quickly. That can be an advantage in short break situations, but otherwise might lead to a lack of satisfaction.
The one that really helped me was Gawith, Hogarth & Co. Dark Flake. Also, Brown Twist, 1792, Lakeland Dark, etc. If those are unavailable, I also relied on HH Bold Kentucky and GL Pease JackKnife Plug. In addition to the amped up strength, these blends are also quite tasty and I think would lead to a more satisfying experience, overall.
I also used Swedish Snus as a backup for when smoking a bowl was impossible, but I needed a quick fix. Eventually, my nicotine addiction settled down to the point where I didn't need it, but in the beginning, the snus was an important part of setting myself up for success, so that I didn't run to the cigarettes when in a pinch.
Good luck to your friend. I am so glad I made the switch!