What is one major consequence of cigarette use on fingernails?

Cigarette use can significantly impact the appearance and health of fingernails, with one major consequence being yellow or brown discoloration. This discoloration occurs due to the tar and nicotine in cigarettes, which can stain the fingers and nails as a direct result of smoking. Over time, with continued exposure, the nails can develop a persistent yellow or brown tint, which is often considered unsightly and can indicate overall health issues linked to smoking.

Consideration of other potential consequences, such as increased brittleness or the formation of ridges, while applicable to some extent, does not carry the same level of visibility and immediate recognition as discoloration. Improved strength, on the other hand, is not a valid consequence of cigarette use, as smoking is generally detrimental to nail health. The negative impacts on nail quality and appearance make discoloration a prominent and recognizable consequence of cigarette use.