Gateway drug

/ɡˈeɪtweɪ dɹˈʌɡ/

Gateway drug

a habit-forming drug that is not addictive but its use may lead to the use of other addictive drugs

Examples

1. But dinosaurs are a gateway drug.

2. The sizzle's the gateway drug to the steak.

3. Content is the gateway drug to success in our society.

4. Content is the gateway drug to every single thing in our society.