The phrase "a fatal effect on" is correct and usable in written English.
It can be used to describe an impact or consequence that is deadly or extremely harmful in nature.
Example: "The new policy had a fatal effect on the local wildlife, leading to a significant decline in their population."
Alternatives: "a deadly impact on" or "a lethal consequence for".
Losing your rating or being downgraded can have a fatal effect on your country's ability to borrow money on the markets.
I have known many true connoisseurs, with excellent tastes that range across the humanities and the culinary arts — and they never fail to have a fatal effect on my self-esteem.
"What we are looking for is some form of viable chemical device," a police official said, "a device that would have a fatal effect on someone standing nearby both from the explosion and from the chemical it contained".
The decision today may well have a fatal effect on New York City's Local Law 3, the Youth Protection Against Tobacco Advertising and Promotion act, which was passed in 1998 and imposes the same 1,000-foot 1,000-footn as the Massachusetts restriction
The natural stream of water, in turn, leads to a fatal effect on fishes and suppresses the growth of microorganisms (Puvaneswari et al. 2006).
Envy, Pride, Anger, Gluttony and Lust are some of the misdemeanours considered so serious by the Church that they could have a fatal effect on an individual's spiritual health.
This accusation had an almost fatal effect on S1's life, as that accusation was related to her husband's attempt to force her to sign divorce papers.
Extreme temperatures can have a fatal effect while sleeping.
Poison, in biochemistry, a substance, natural or synthetic, that causes damage to living tissues and has an injurious or fatal effect on the body, whether it is ingested, inhaled, or absorbed or injected through the skin.
Air pollution, chiefly from traffic exhaust fumes in cities, is having a serious and sometimes fatal effect on health, according to two studies that link it to lung cancer and heart failure.
Chemicals that are found in most tap water will have a detrimental and possibly fatal effect on your plants.
