The tweets- which were written before the 19-year-old auditioned for the show- referred to cannabis use.
One reportedly read: "Always smoke upon one before sleep," whilst another one said: "Come smoke herb with the boyz again soon pretty princess xxx (sic)."
The latest scandal comes just hours before Jake is set to appear alongside his Stereo Kicks band mates in tonight’s X Factor ‘Fright Night’.
X FACTOR CHLOE JASMINE REPORTEDLY 'CHEATS' ON BOYFRIEND WITH STEVI RITCHIE
But Jake is keen to distance himself from the controversy, with a friend of the singer claiming he is ‘not proud’ of his pre-X Factor past.
A source close to the teenager said: "Jake's not proud of how he's behaved in the past.
"He has done a lot of growing up over the past year and in no way wants to let his fans, or his band mates, down.
"He holds his hands up and accepts how stupid his behaviour was, but wants to put this behind him and focus on making the most of the opportunity he has been given.
"The tweets about crack are actually references to song lyrics and he has never smoked or sold crack."
An X Factor spokesman said: "The X Factor does not condone the use of drugs in any way and appropriate action will be taken against any contestant found to be taking drugs while involved with the programme."
Tune into the X Factor tonight at 8pm on ITV, and follow @CloserOnline for our live tweets.
Find out more about Stereo Kicks below:
Who are the EIGHT members of the new X Factor boy band?
1 of 8Jake Sims, 19
Jake turned up with his little sister when he sang Stevie Wonder’s ‘Superstition’ to the judging panel. He charmed his way to the arena stages where he gave the judges a rendition of Arctic Monkeys’ When The Sun Goes Down. (Plus he has an adorable Bristol accent!)
2 of 8Reece Bibby, 15
Reece was nearly turned away by the judges after they became fed up of hearing samey guitar playing audtionees. He impressed them with his unique cover of Disclosure’s ‘Latch’.
3 of 8Casey Johnson, 19
Essex boy Casey wowed the judges with his room audition (and admitted his hobby was chasing girls!) by blasting out ‘Please Don’t Let Me Go’ by a fellow cheeky chappy, Olly Murs.
4 of 8Tom Mann, 20
Simon was unsure about instant heartthrob Tom when he told the crowd that they would not have the same reaction if he were ugly. Tom proved Simon wrong with an acoustic rendition of Backstreet Boys’ ‘I Want It That Way’.
5 of 8Barclay Beales, 18
Barclay previously tried his hand a yodelling but decided to put his 'yodelling talents' aside and try his hand at singing. He sang the judges a cover of Robbie Williams’ ‘Angels’ that left Cheryl grinning and the audience cheering. Simon, however, told Barclay that he felt he would be ‘better off in a group’.
6 of 8Charlie Jones, 14
Charlie impressed the judges with his own take on The Spice Girls’ ‘Wannabe’ where he changed up the lyrics to congratulate Cheryl on her wedding- what a sweetheart! He’s the baby of the band at just 14-years-old.
7 of 8James Graham, 17
James made a major faux pas during his room audition when he told dog-lover Simon that he didn’t like animals. Luckily, James was able to impress Simon with his amazing voice.
8 of 8Chris Leonard, 18
Chris recently packed his bags and moved to London from his native Ireland in an effort to make a go with the X Factor boy band. Though he wasn’t featured in the auditions section of the show, he was added to the boy band after becoming known for song covers he posted on YouTube and Twitter.