Smoking has several meanings:

• Smoke is a byproduct of fire
• Tobacco smoking, tobacco and various other substances can be smoked and inhaled, see also cannabis, hashish, cocaine, DMT, heroin, PCP, and methamphetamine
• Smoking is a method for curing meat
• Smoking is a film by Alain Resnais
• "Smoking" can be a reference to someone's physical attractiveness