Parents of teens and young adults, beware. Smoking, including vaping, continues to be the biggest health risk. A US-centric multi-authored study finds that in the age group of 18-24 years, nicotine and cannabis remain high-risk consumption items. Additionally, young adults in America are also consuming the deadly cocktail of alcohol and cigarettes. Globally, smoking and drug abuse continue to affect nearly 14% of the youth, and over 5.6% of the world population in the age group of 16-64 years is consuming drugs, say the study experts.