Sorry for the late reply Bro. You have to level up your drug-making skill to max.
Chang is also in Sicae
Also buy the cleaning materials in the store to maximize your earnings.
1. Tap the small papers.
2. Tap the hexanyl powder on the upper left corner.
3. Tap the hexanyl powder 3 times so it would spread on the small paper.
4. Tap the paper 2 times to roll.
5. Tap the lip-like icon.
6. Tap the cigarette.
