I think Puff has probably had a pretty serious drug/alcohol problem for most of his adult life. It's just money, fame, can keep you somewhat protected from a lot of the consequences that "normal" people face. Like work issues, funding a habit. They have circles of enablers and handlers to help them, and keep them protected. But, if you look at his behavior
1999: Steve Stoute beating
1999: Club NY shooting, there was cocaine residue in the Lincoln Navigator, Shyne was the lil homie, he'd be taking his cues from Puff, so we can assume that Puff did coke and was doing it that night
Black Rob recounted a story on some podcast of Puff showing up to his house months/weeks after BIG's death, rolling on E, saying
"I love you Rob, you my brother", which he described in a funny way, but again, there's a pattern
Him beating up a UCLA coach also seemed like someone on drugs, throwing a barbell at them LOL
The Cassie lawsuits points to a serious drug issue as far back as 2006, when she met him. His general public behavior is pretty indicative of someone with a bad drug habit. Dozens of public appearances where he seems drunk. Sunglasses on inside.
-A recent breakfast club interview, where he's slurring and talking all raspy, drinking at like 8:00 AM
-I rarely saw his social media, but a few clips that have been making the rounds lately, he is clearly on drugs/drunk
-That French Montana birthday video, he's raspy like he's been up all night
-There's some video of him with a little white girl that he's clearly high in
-The infamous Drink Champs appearance where he's again clearly drunk and on drugs, and slurring his words
I think it would be easier to point a recent public appearance where he wasn't drunk or high.