[junon]

That's... not true, lol. That can be true, especially for psychedelics, but that's absolutely not true of other drugs.

MDMA comes to mind. I've also heard (though not tried, nor will I) the harder narcotics such as heroine and meth are almost never as good as the first time.

The first time being the best time is often exactly why people become addicts.

[jampekka]

That's more like the first time having sex can be special. The novelty gives it a lot of extra. But like in sex, you'll learn to be better at using drugs and the experiences become richer and more pleasurable.

[chronogamous]

Know then that what you've heard is incorrect. Heroin especially tends to cause nausea and vomitting on first time use, as the body reacts to something as unexpected. Meth may be great the first time round, and still be nowhere near as good as it can be - the drug has a steep learning curve and requires rigorous discipline for it's effect to be exploited fully - a mindset rarely present in first time users. With practically any drug, initial effects are very much subject to the intention of the person taking it, just as much as physical attributes (fitness, body-type, metabolism, etc).

Not to downplay all obvious and less obvious hazards of these 'harder' narcotics, just saying the whole 'first time being the best time' as an explanation of why exactly people become addicts relies very much on hearsay. It's the sort of language that came with the whole war-on-drugs-thing, and does not reflect reality.