Justin Bieber is under the influence … of Lil Twist — and the rapper may be leading Justin down a dangerous path, reports TMZ. Lil Twist was with Justin in a Newport Beach hotel room last week, where he was happily rolling blunts for J.B. and others.

According to TMZ … Justin and Twist have become tight … and have been smoking together on a number of other occasions.

Twist was speeding on the 405 Freeway New Year’s Day in Justin’s Ferrari when he was pulled over by cops. A photog was killed trying to snap pics of the traffic stop. Prior to the accident, Twist and Justin had spent much of the day in a room at the Four Seasons Hotel in Beverly Hills — where Justin frequently gets a room.

Sources involved in Justin’s life who care about him are deeply concerned that Twist has become a powerful negative influence in his life and feel very strongly Justin needs a clean break from the rapper or else bad things are going to happen.

FYI … Lil Twist is signed by Lil Wayne and close knit with the Cash Money and Young Money crews.

Do you think Lil Twist bad influence on Justin?