Purim is a lot of fun, and a lot of fun sometimes means danger - of all kinds.
Bikur Cholim of Rockland County has a poster for people to print and post about drinking and driving.
View Poster PDF Full-Size
Also, smoking - there is no source for smoking on Purim - except perhaps in some Purim-Torah, perhaps.
PLEASE - do not give kids a cigarette! If you see someone doing it, stop them! You will be doing a mitzvah mid'oraysa. Tobacco is the most addictive substance known.
Have a freilichen and kosher Purim! 