What are the dangers of synthetic drugs?

Synthetic drugs have become popular due to the fact that people believe it'll give you a "safe" high. In addition, they’re easy to get a hold of and they're technically legal. These drugs are manmade, and as a result the potency of the drug is in the hands of the manufacturer, which makes every dose different. These drugs could be laced with other drugs like fentanyl. Even a small amount of fentanyl could cause an overdose because that's how powerful it is. Drug tests don't pick up on synthetic drug which is another reason why they're popular among teenagers, since many teens look for a way to get high without getting caught. You can't tell if someone has taken anything and there's no familiar odour with synthetic drugs - some are odourless. The use of synthetic drugs can have many side effects that include: anxiety, aggressive behaviour, paranoia, seizures, loss of consciousness, nausea, vomiting, and even coma or death.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.