Srila Prabhupada Recommends to Avoid these 4 Things as these are the Main Pillers of Sinful Activities.

Gambling turns a person into a liar, a cheat. Gambling invariably puts one into anxiety and fuels greed, envy, and anger.

One turns one's body into a graveyard by consuming dead animals. These foods are saturated with the modes of passion and ignorance and therefore cannot be offered to the Lord.

Drugs, alcohol, and tobacco, as well as any drink or food containing caffeine, cloud the mind, over-stimulate the senses, and make it impossible to follow the principles of bhakti-yoga.

Cleanliness is destroyed by illicit sex. This is sex outside of marriage or any sex for any purpose other than procreation.