05AB1E, 8 bytes

žPS¡¦õÊP

Uses the 05AB1E encoding. Try it online!

05AB1E, 8 bytes

Code

žPS¡¦õÊP

Uses the 05AB1E encoding. Try it online!

Explanation

žPS¡         # Split the string on consonants (bcdfghjklmnpqrstvwxz)
    ¦        # Remove the first element of the array to handle cases when the
               string starts with a consonant
     õÊP     # Check if the empty string is not in the array

Example

             # "popularize"
žPS¡         # ['', 'o', 'u', 'a', 'i', 'e']
    ¦        # ['o', 'u', 'a', 'i', 'e']
     õÊ      # [1, 1, 1, 1, 1]
       P     # 1