Cocaine needs to be mixed with baking soda and water then heated up in water to create a salt I think it is that vaporizes when heated up. That's crack and that's one of two methods of making the crack form of cocaine. The other method requires more chemistry and smells bad when making it. The high from a hoot lasts about 20 minutes. Crack cocaine is so addictive that a evening of smoking it will get a person dreaming of more and yearning for it for days. A serious crack binge can last for maybe 2-3+ days without sleep and then the person is getting pretty tired and can damage their heart too because their heart beat is very high when high on crack. It's that powerful and good as a drug. Down and durty method is to mix a drop of water with equal parts cocaine and baking soda on tin foil and letting it dry and then heating the bottom of the foil with a lighter and inhaling the vapour. It's fast to make, gives a good hoot and a decent high for maybe ~10 minutes. Cocaine is far less addictive and the high is nowhere close to crack. So crack has a far worse reputation accordingly. My best advice is avoid tweakers. A tweaker is a person that smokes a large amount and gets really tweaked. They sometimes are desperate for money and due to the nature of the crack high people become aggressive and do things they probably would not do otherwise. The social disorder caused by crack is one reason why it is considered worse than cocaine.
I disagree with part of this. AFAIK all studies have linked addictive potential to both the rapidity of onset, and the rapidity of offset. This is amply demonstrated by drugs in the same class such as opiates operating on the same receptor, and therefore which share the same mechanism of action. All the "safer" forms of opiates used for maintenance replacement are long acting, e.g. methadone and buprenorphine. But your point is well taken: methamphetamine has largely (but not completely) supplanted cocaine as the stimulant of choice. There are two main reasons: users are no so different than any other consumers: convenience and cost matter a great deal, and meth rules: $100 dollars might buy a two day supply vs an afternoon's.
Secondly, methamphetamine can be synthesized from what used to be easily available industrial/medical supplies and factories will pop up where ever laws are sufficiently lax and corruption is high. Contrast that with coca leaves which are grown in a relatively circumscribed ecosphere and typically need to pass through several ports before landing in the states, and where the grower countries can be easily coerced by the USA into containment measures.
While double blind tests reveal that the effects are difficult if not impossible to discern by the most experienced of users (except insofar as one wears off within minutes to a couple of hours at most vs 4 to 6, most stimulant fans express a preference for the high of cocaine, citing some of the same ineffable reasons that vinyl lovers prefer PVC to polycarbonate. Unfortunately, fentanyl is characterized by a quick off and low cost (to manufacturers), which makes the drug devilishly difficult to control due to high demand and large supply.