def every_third(original_list):
    """(list) -> (list)

    Takes the original_list list and returns a new list consisting of every
    third element in the original_list. Function will use a while loop.

    >>>every_third([10, 5, 8, 12, 4, 16])
    [8, 16]
    """
    new_list = []
    counter = 0
    while counter <= len(original_list):
        if (original_list[counter + 1] % 3) == 0:
            new_list.append(original_list[counter])
        counter = counter + 1
    return new_list