Smitten is the past participle of the verb 'smite'.
The present tense would be:
The present participle is smiting.
Note: smitten is also an adjective. The adjective form does not
have any tenses as it is not a verb.
My husband who claims never to have lilked dogs seems very
smitten by our neighbor's new puppy. My fourth grader, who truly
dislikes school, has asked to stay for the after school tutoring
program only because he is smitten with the new girl who helps out