Science is about replication of results. For example, if Alice did X and got Y, then published a paper about it, and Bob did X and got Y, and Charlie did X and

Science is about replication of results. For example, if Alice did X and got Y, then published a paper about it, and Bob did X and got Y, and Charlie did X and got Y, then X->Y is scientifically proven. If well known and proven scientist Alice said that X may cause Y, then it is just Alice words, not a science.