What are my chances of becoming addicted to ecstasy?

i take 1-2 pills a month. i don't have any family history of addiction and i've never been addicted to anything else (including the weed i used to smoke quite frequently). is taking 1-2 pills a month enough to become addicted to? and what are the most common long term effects of this dosage?

: http://alcoholdrugstreatment.info/what-are-my-chances-of-becoming-addicted-to-ecstasy