When plastic is heated it releases BPA (Bisphenol A) which is an endocrine disruptor and thus has an adverse effect on our reproductive system. Definite proof of cancer has not been found yet.
Also plastic bottles/cups should not be reused and water left in the car for over a day should not be consumed.
It’s not just tea. Drinking anything hot in a substandard plastic cup is injurious to health. And having chips or something like that in a plastic bag can also do harm.
So in all sense, tea, coffee or soup when served hot in plastic cups may cause some degenerated reaction of the plastics and some chemicals may get dissolved in the hot liquid and can get consumed while drinking the hot drink . It is best to use plain paper cups which can be disposed easily and are more environmentally friendly also.
*AMONG A LONG LIST OF OTHER PROBLEMS*, drinking water from plastic bottles left to bake in your car WILL INCREASE YOUR RISK OF GETTING CANCER, although the risk factor is a function of your current level of health, the relative quality of the plastic containing the water (THERE ARE NO SAFE PLASTICS, but some are worse than others), the temperature achieved, the length of time it was in the sun, & whether or not a person consumes water from hot plastic on an ongoing basis, not to mention the quality of the water pumped into the bottle to begin with.
Apart from the pthalate exposure, drinking water from hot plastics increases your exposure to Bisphenol-A (BPA), a potent hormone disruptor which is known to attack the body IN MYRIAD WAYS, including elevating one’s risk of breast & prostate cancer.
It’s useful to know that while plastic goods & canned goods producers have learned that the public is catching on & they are producing “BPA-FREE” versions of their products, it is being reported that THE ALTERNATIVE CHEMICAL INGREDIENTS BEING USED ARE TYPICALLY AS BAD **OR WORSE** THAN BPA.
In conclusion, experiments with viable skin models unequivocally demonstrate that BPA is readily absorbed and metabolized by the skin. The trans-dermal route is expected to contribute substantially to BPA exposure in human, when direct contact with BPA (free monomer) occurs.