swear off

No — say "I swore off smoking.". the verb 'swear off' requires a gerund (-ing) or a noun, not an infinitive with 'to'.

Definition

phrasal verb. to promise that you will stop doing something or using something that is bad for you.

phrasal verb. to make a solemn or firm resolution to abstain from a particular substance, habit, or person. Transitive and inseparable.

simple

“I have decided to swear off sweets for a month.”

contextual

“After a terrible headache the next morning, he vowed to swear off alcohol for good.”

complex

“Disillusioned by the recent political scandals, many voters have sworn off participating in the upcoming local elections entirely.”

usually followed by a noun or a gerund (-ing form) representing the habit being abandoned.

contrast with 'give up'; 'swear off' implies a more formal or dramatic promise to oneself, often following a negative experience.

I swore off to smoke.

I swore off smoking.

the verb 'swear off' requires a gerund (-ing) or a noun, not an infinitive with 'to'.

Particles

off

Separability

inseparable

Pattern

swear + off + object

take upindulge in