True or False: An oral temperature can be affected by smoking.

An oral temperature can be indeed affected by smoking because smoking can introduce heat to the oral cavity and cause an immediate, temporary increase in temperature readings. When a person smokes just before having their oral temperature taken, the heat from the smoke can result in a measurement that is higher than the actual body temperature. This is why it is generally recommended to wait a short period after smoking before taking an oral temperature to ensure accuracy.

The other choices do not accurately encapsulate the relation between smoking and temperature readings. It's not a matter of whether it's conditional on the amount smoked or only in certain individuals; the act of smoking itself can affect everyone, making it essential to consider when taking oral temperatures.