Use 'cloying' to describe something overly sweet, like a taste or smell that is overbearing. The air was filled with the cloying aroma of cotton candy at the fair.
Pro Tip 2/3
Negative Connotation
When saying 'cloying', it implies something negative, not just sweet. She wore a cloying perfume that left me with a headache.
Pro Tip 3/3
Avoid in Formal Writing
'Cloying' often appears in creative writing or personal opinions, not in formal or academic contexts. His love letter was so cloying it felt embarrassing to read.