To be perfectly blunt, if you're a Westerner, not one bit. Generally you're a tourist and so they don't bat an eye or even check your bags for duty free limits.

They do also randomly check your bags if you're Korean since many take weekend trips to shop it up.

Also, many Southeast Asian/Chinese tourists and visitors often come here and overstay their visa, disappear, etc.

Stereotyping it may be, but they're most cautious about those than random whitey American or European coming over.