16 for beer and wine; 18 for "alco-pops", "Schnaps", hard liquor and anything that is "too strong". Smoking is allowed at the age of 16.
With you being 15, you can get into serious trouble if the police catches you under the influence of alcohol and or drugs. We also have a drinking limit for under 18s - you have to be sane which means you must not overstep the limit of 0,6‰.