Yeah, actually it was a Lemon Pledge odor, not the lemon scent of Thai.
As a teenager, I grew up on Columbian Gold. I distinctly remember a bell going off in my head the first time I smoked LP1, that the buzz was VERY similar to the buzz of the Columbian of old. Maybe there was something else in it, but I think I would have noticed Thai influence if it were significant.
Regardless, if you can get the old LP1, in seed form or cutting, it would be worth your while if you enjoy sativas.