Disposables paper cups are coated with wax to prevent water seeping into the paper.When hot liquid is poured into the paper cup, some wax will be dissolved and drink together with the liquid.Over the long run , this will create problem in our stomach. Using glass , the world most least reactive material(asyou remember in your schooldays science projects, acid can be stored in glass and blood is stored in glas tube in hospitals.
Ceramic mug is another good choice other than stainless mug but never ever use plastic ones
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