And besides, drugs are illegal. Drug use at conferences threatens the existence of future conferences. If you do, you will be sent home at your own expense. They don't impress people, they tend to be very harmful to people and objects. Overall, they aren't nice things.
Cons are really nice things.
Bad things and nice things don't mix very well. Each site has specific guidelines which participants are asked to follow. For example, if the conference is at a church, participants may be asked to refrain from entering the minister's office or raiding the kitchen fridge, etc. Your district may have some rules I haven't mentioned here. You'll know them because they won't fall under any of the categories I have mentioned.