A commercial driver's license (CDL) is a driver's license required in the United States to operate any type of vehicle. 1  weighing 26,001 pounds or greater, or any combination of vehicles weighing 26,001 pounds or greater when towing a trailer weighing more than 10,000 pounds.
The cause of drug abuse is not fully known but likely include genetic predisposition, co-occurring conditions and environmental circumstances. Drug use and experimentation is common in pre-adolescents and adolescents, but only a small percentage of those users will go on to abuse drugs.hile many people use drugs, only a small percentage abuse drugs, but it has been noted drug abuse often runs in families, suggesting genetics is one of the causes of drug abuse.
The abuse of prescription drugs is a growing problem. If you know someone who is overusing prescription drugs or using illegal drugs, call 1-888-652-3778 for more information about chemical dependency treatment centers and how treatment can help.any different substances can be abused, and people can develop an addiction to many of these drugs. Some of the most commonly used and abused chemical substances include: 1  Alcohol. 2  Marijuana. 3  Stimulants, such as cocaine, methamphetamine, and amphetamines. 4  Hallucinogens, such as LSD, mescaline, PCP, and psilocybin.