I've had friends who've done everything imaginable. I've smoked everything "natural", and tried some other drugs. When I was offered something that I didn't want, no one goaded me into it.
Where Houston is different. By all accounts she didn't smoke, drink or do drugs before Bobby Brown. He's tad amount to a drug dealer hooking someone to make money. But, in his case, he just wanted to make his wife manageable and as fucked up as himself.
If she had not met him, her life would not have crashed and burned the way it did. There isn't even a doubt of that. She died the day she met Bobby Brown. She tried to clean herself the day she dumped him. It was just too late.