Random drug testing

hello people

been at a new job for a few weeks, found out today they do random drug testing and someone actually failed and got sacked before i joined. i am now shitting it because i am an occasional smoker, like every weekend instead of going to pub on a saturday night.

does any one have any advice ? reassurance ? do they specifically pick people they think might be using drugs? do i needa quit? i have no idea what to do lol

i don’t really want to stop as i like my weekend smoke but i am very nervous

thanks ppl :)