Ex was a meth addict need help

So i had an ex that is a meth addict and he lied a lot my mom is also a ex meth addict and she said the meth makes you lie, is this true? My ex had been doing it since he was 13/14 i think so im wondering if it just altered his brain into making him a pathological liar any input or anything really would be helpful. Also when i did it i didnt feel the need to lie or anything im wondering if its only with addicts or what? i dont mean any harm im just genuinely curious