However, even though the international adventure further sharpened his riding skills, Smith's first race back on home soil last week was still a stern test.
"The course at Huntly was a lot different to what I'd been riding in the US. I was actually quite worried about the high speeds. In the US it's a lot more technical and tight and not wide-open farmland like New Zealand.
"So I just tried to control the race from the front. When I got into the lead I slowed it down a little, trying to keep riders behind me.
"But then Mark Penny got past me and I had to go hard out again," said the BikesportNZ.com-sponsored rider, now racing a Yamaha YZ250 two-stroke instead of the YZF250 four-stroke he used to win his two national crowns.
"I snatched the lead back and then stretched out my advantage as much as I could without being silly. In the end, I finished about two minutes ahead of Mark."
Penny was also satisfied with his result, his first ride for the new Wilksbrooke Motors-supported Bel-Ray Suzuki Off-road team.
"The drizzle was persistent and, combining that with the dust being kicked up off the dry trails, it was a nightmare on goggles," said Penny.
"On the third lap I decided I had to pass Adrian and get out of the dust, so I picked up the pace and past him on a tricky uphill. I was feeling pretty comfortable with the speed and everything was going well but I had used up all my goggle roll-offs following in the dust, so vision was becoming a problem.
"Adrian pulled back up to me after a lap and passed me back, flicking up a rock as he went past that smashed into my goggles and finished them off.
"After that it was a matter of trying to go as fast as possible while not being able to fully see the track. Adrian slowly pulled a gap on me and at the end of the two-hour race I had to settle for second place."
The next race in the three-round series is in Huntly on January 13.